Based on the standard reduction potentials above, which reaction(s) is (are) spontaneous?
(P) `Cr^(2+)(aq)+Fe^(3+)(aq)rarrCr^(2+)(aq)+Fe^(2+)(aq)`
(Q) `Cu^(2+)(aq)+Fe^(2+)(aq)rarrCu^(2+)(aq)+Fe^(3+)(aq)`
A. P only
B. Q only
C. Both P and Q
D. Neither P nor Q