Multiply the Expression as You Would Multiply Polynomials $$\left( x ^ { 7 / 2 } + y ^ { 9 / 2 } \right) ^ { 2 }$$

Multiple Choice

Multiply the expression as you would multiply polynomials. $$\left( x ^ { 7 / 2 } + y ^ { 9 / 2 } \right) ^ { 2 }$$

A) $\quad x ^ { 7 } + 2 x ^ { 7 / 2 } y ^ { 9 / 2 } + y ^ { 9 }$
B) $\quad x ^ { 7 } - 2 x ^ { 7 } y ^ { 9 } + y ^ { 9 }$
C) $\quad x ^ { 7 } + x ^ { 7 } y ^ { 9 } + y ^ { 9 }$
D) $\quad x ^ { 7 } + y ^ { 9 }$