Use Properties of Rational Exponents to Simplify the Expression $$\left( x ^ { - 1 / 4 } y ^ { 7 / 5 } \right) ^ { 3 / 4 }$$

Multiple Choice

Use properties of rational exponents to simplify the expression. Assume that any variables represent positive numbers.
- $$\left( x ^ { - 1 / 4 } y ^ { 7 / 5 } \right) ^ { 3 / 4 }$$

A) $x ^ { 1 / 2 } y ^ { 43 / 12 }$
B) $x ^ { 3 / 16 } y ^ { 21 / 20 }$
C) $\frac { y ^ { 21 / 20 } } { 3 / 16 }$
D) $- x ^ { 3 / 16 } y ^ { 21 / 20 }$