Which One of the Following Expressions Is the Correct Representation $1 / \sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$

Multiple Choice

Which one of the following expressions is the correct representation for the speed of light in vacuum?

A) $1 / \sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$
B) $1 / \varepsilon _ { 0 } \mu _ { 0 }$
C) $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$
D) $\sqrt { \varepsilon _ { 0 } / \mu _ { 0 } }$
E) $\sqrt { \mu _ { 0 } / \varepsilon _ { 0 } }$