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Let $p$ be a prime number. Denote by $\mathbb{Z}_p$ the set of congruence classes modulo $p$. Find the number of squares in $\mathbb{Z}_p$.

A

$p$

B

$p/2$

C

$(p-1)/2$

D

$(p+1)/2$

E

$\lceil (p+1)/2 \rceil$

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