Assume that a and b represent positive real numbers. Which expression is equivalent to (a²/³ b¹/³)¹/²

A. a⁷/⁶ b⁵/⁶
B. a⁴/³ b²/³
C. a¹/² b¹/²
D. a⁴/³ b¹/⁶
E. a¹/³ b¹/⁶