Statements with respect to equivalence partitioning?

What are the true statements with respect to equivalence partitioning?

(a) Input data and output results often fall into different classes where all members of a class are related.
(b) It is a method to partition the requirements into equivalent classes during the requirement analysis process.
(c) Test cases should be chosen to be representative of each equivalence partition.
(d) It is recommended that only boundaries are checked in each partition.
(e) It is recommended that boundaries as well as mid points are checked in each partition.

( A ,b ,c, ) are the true statements with respect to equivalence partitioning