Solve the Problem $a = 6 , b = ? , c = 10$

Multiple Choice

Solve the problem.
-Find the length of the unknown side of the right triangle, where a and b are the legs and c is the hypotenuse. $a = 6 , b = ? , c = 10$

A) $b = 10$
B) $b = 7$
C) $b = 9$
D) $b = 8$