Given the task definition and input, reply with output. In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: if the length of a certain rectangle is decreased by 4 cm and the width is increased by 3 cm , a square with the same area as the original rectangle would result . find the perimeter of the original rectangle .
Options: ['a ) 40 cm', 'b ) 45 cm', 'c ) 50 cm', 'd ) 52 cm', 'e ) 57 cm']
c