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: find the number of divisors of 1080 excluding the divisors which are perfect squares . 
Options: a ) 28 , b ) 29 , c ) 30 , d ) 31 , e ) 32
a