If r and s are negative integers, which of the following statements must be true?
I. (-r)^s is positive.
II. (-r)^(-s) is positive.
III. r^(-s) is positive.	Select the correct option
A) None B) II only C) I and II D) I and III E) I, II and III
Let's r = -2 and s = -3   I. (-r)^s = (2)^(-3) = 1/(2^3) --&gt; Positive   II. (-r)^(-s) is positive. = 2^3 --&gt; Positive   III. r^(-s) is positive. = -2^3 --&gt; Negative   Answer: I and II
<result>C</result>
If r and s are negative integers, which of the following statements must be true?
I. (-r)^s is positive.
II. (-r)^(-s) is positive.
III. r^(-s) is positive.