List the ordered pairs in the equivalence relations produced by these partitions of {a,b,c,d,e,f,g}.

a. {a,b},{c,d},{e,f,g}
b. {a},{b},{c,d},{e,f},{g}
c. {a,b,c,d},{e,f,g}
d. {a,c,e,g},{b,d},{f}