A gaseous system changes from state `A (P_(1), V_(1),T_(1))` to `B (P_(2), V_(2),T_(2))` to `C(P_(3), V_(3),T_(3))` and finally from `C` to `A`. The whole process may be called :
A. Reversible process
B. Cyclic process
C. Isobaric process
D. Spontaneous process
