What Are the Possible Combinations of Multiple Bonds and Rings

What are the possible combinations of multiple bonds and rings if a compound's index of hydrogen deficiency equals 2?

A) two rings; one ring and a triple bond; two triple bonds
B) two rings and a double bond; three rings; one ring and two double bonds; two triple bonds
C) three rings; two rings and a double bond; one ring and two double bonds; two triple bonds; one ring and one triple bond
D) two rings; one ring and a double bond; two double bonds; one triple bond
E) two rings; two double bonds; a ring and a triple bond; one double bond and one triple bond