Solve and Check the Equation $2 x ^ { 7 / 2 } - 4 = 0$

Multiple Choice

Solve and check the equation.
- $2 x ^ { 7 / 2 } - 4 = 0$

A) $\{ \sqrt [ 7 ] { 4 } \}$
B) $\{ \sqrt [ 7 ] { 2 } \}$
C) $\left\{ \frac { 4 } { 7 } \right\}$
D) $\varnothing$