Which of the Following Functions Solves the Differential Equation $y ^ { \prime } = - 4 y$

Multiple Choice

Which of the following functions solves the differential equation: $y ^ { \prime } = - 4 y$ ?

A) y = $e ^ { - 4 t }$
B) y = - $e ^ { - 4 t }$
C) y = ln 4t
D) none of these