A polynomial of degree four with leading coefficient 1 and integer coefficients has two zeros, both of which are integers. Which of the following can also be a zero of the polynomial?

$ \textbf{(A)} \ \frac {1 \plus{} i \sqrt {11}}{2} \qquad \textbf{(B)} \ \frac {1 \plus{} i}{2} \qquad \textbf{(C)} \ \frac {1}{2} \plus{} i \qquad \textbf{(D)} \ 1 \plus{} \frac {i}{2} \qquad \textbf{(E)} \ \frac {1 \plus{} i \sqrt {13}}{2}$
1. Let \( P(x) \) be a polynomial of degree four with leading coefficient 1 and integer coefficients. Given that \( P(x) \) has two zeros which are integers, we can write:
   \[
   P(x) = (x - a)(x - b)Q(x)
   \]
   where \( a \) and \( b \) are integers, and \( Q(x) \) is a quadratic polynomial with integer coefficients.

2. Since \( P(x) \) has integer coefficients, any non-integer zero must appear in conjugate pairs to ensure the coefficients remain integers. This is due to the fact that the coefficients of a polynomial are symmetric functions of its roots.

3. We need to determine which of the given options can be a zero of \( P(x) \). The options are:
   \[
   \textbf{(A)} \ \frac{1 + i \sqrt{11}}{2}, \quad \textbf{(B)} \ \frac{1 + i}{2}, \quad \textbf{(C)} \ \frac{1}{2} + i, \quad \textbf{(D)} \ 1 + \frac{i}{2}, \quad \textbf{(E)} \ \frac{1 + i \sqrt{13}}{2}
   \]

4. For a number to be a zero of a polynomial with integer coefficients, it must be an algebraic integer. An algebraic integer is a root of a monic polynomial with integer coefficients.

5. Consider option \(\textbf{(A)}\):
   \[
   \alpha = \frac{1 + i \sqrt{11}}{2}
   \]
   To check if \(\alpha\) is an algebraic integer, we need to see if it satisfies a monic polynomial with integer coefficients. We can start by finding the minimal polynomial of \(\alpha\).

6. Let \(\alpha = \frac{1 + i \sqrt{11}}{2}\). Then:
   \[
   2\alpha = 1 + i \sqrt{11}
   \]
   Squaring both sides:
   \[
   (2\alpha)^2 = (1 + i \sqrt{11})^2
   \]
   \[
   4\alpha^2 = 1 + 2i \sqrt{11} - 11
   \]
   \[
   4\alpha^2 = -10 + 2i \sqrt{11}
   \]
   \[
   4\alpha^2 + 10 = 2i \sqrt{11}
   \]
   Squaring again:
   \[
   (4\alpha^2 + 10)^2 = (2i \sqrt{11})^2
   \]
   \[
   (4\alpha^2 + 10)^2 = -44
   \]
   \[
   16\alpha^4 + 80\alpha^2 + 100 = -44
   \]
   \[
   16\alpha^4 + 80\alpha^2 + 144 = 0
   \]
   Dividing by 16:
   \[
   \alpha^4 + 5\alpha^2 + 9 = 0
   \]
   This is a monic polynomial with integer coefficients, confirming that \(\alpha\) is an algebraic integer.

7. The other options can be checked similarly, but they do not satisfy the conditions for being algebraic integers in the same way. For example, \(\frac{1 + i}{2}\) and \(\frac{1}{2} + i\) do not lead to monic polynomials with integer coefficients.

Conclusion:
\(\boxed{\textbf{(A)}}\) is the only option that can be a zero of the polynomial.