Mashaal Masha
Which of the following is equivalent to $\left(a+\frac{b}{2}\right)^{2}$?
Difficulty: Hard
A: 

$a^{2}+\frac{b^{2}}{2}$

B: 

$a^{2}+\frac{b^{2}}{4}$

C: 

$a^{2}+\frac{ab}{2}+\frac{b^{2}}{2}$

D: 

$a^{2}+ab+\frac{b^{2}}{4}$

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