Find the Differential Dy of the Function $$y = 2 x ^ { 3 / 7 }$$

Multiple Choice

Find the differential dy of the function $$y = 2 x ^ { 3 / 7 }$$

A) $\frac { 6 } { 7 } x ^ { - 4 / 7 } d x$
B) $- \frac { 3 } { 7 } x ^ { - 4 / 7 } d x$
C) $2 x ^ { - 4 / 7 } d x$
D) $\frac { 3 } { 7 } x ^ { - 4 / 7 } d x$
E) $2 x ^ { 10 / 7 } d x$