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

Ex Input:
Problem: the area of a square is equal to nine times the area of a rectangle of dimensions 121 cm * 144 cm . what is the perimeter of the square ? 
Options: a ) 1500 cm , b ) 1800 cm , c ) 1584 cm , d ) 1718 cm , e ) 1086 cm

Ex Output:
c


Ex Input:
Problem: what is the perimeter of a square field whose diagonal is 4 √ 2 ? 
Options: a ) 16 m , b ) 32 m , c ) 27 m , d ) 26 m , e ) 76 m

Ex Output:
a


Ex Input:
Problem: the product of the squares of two positive integers is 81 . how many pairs of positive integers satisfy this condition ? 
Options: a ) 0 , b ) 1 , c ) 2 , d ) 3 , e ) 4

Ex Output:

c