Let I be a set of all lines in a XY plane and R be a relation in I defined as R = {(I1, I2):I1 is parallel to I2}. What is the type of given relation?

Let I be a set of all lines in a XY plane and R be a relation in I def

1.	Let I be a set of all lines in a XY plane and R be a relation in I defined as R = {(I1, I2):I1 is parallel to I2}. What is the type of given relation?
A.	Reflexive relation
B.	Transitive relation
C.	Symmetric relation
D.	Equivalence relation
Answer» E.