Find the Formula for the Function $d = 2 x$ B) $d = x \sqrt { 3 }$

Multiple Choice

Find the formula for the function.
-Express the length d of a square's diagonal as a function of its side length x.

A) $d = 2 x$
B) $d = x \sqrt { 3 }$
C) $d = x$
D) $d = x \sqrt { 2 }$