Which of the following describes all values of x for which 4–x^2 >= 0?  Choose the correct choice:
A) x >= 1
B) x <= –1
C) 0 <= x <= 1
D) x <= –1 or x >= 1
E) –2 <= x <= 2
4 - x^2 &gt;=0   means x^2 - 4 &lt;=0   =&gt; (x-2)(x+2) &lt;= 0   =&gt; -2 &lt;= x &lt;= 2   Answer - –2 &lt;= x &lt;= 2
<result>E</result>
Which of the following describes all values of x for which 4–x^2 >= 0?