The speed of light ( c), gravitational constant (G) and plank's constant (h) are taken as fundamental units in a system. The dimensions of time in this new system should be.
a. G¹/²h¹/²c¹/²
b. G¹/²h¹/²c⁻⁵/²
c. G¹/²h¹/²c⁻¹/²
d. G¹/²h¹/²c⁻³/²