For sizing of a gas-to-gas plate-fin counterflow exchanger, we can determine the physical size of…

For sizing of a gas-to-gas plate-fin counterflow exchanger,
we can determine the physical size of the exchanger (with no constraints
imposed on the dimensions) such that:

(a) The pressure drops on both fluid sides will always be
exactly matched.

(b) The critical pressure drop on one fluid side can be
matched; the pressure drop on the other fluid side will be higher than the
specified value.

(c) The critical pressure drop on one fluid side can be
matched; the pressure drop on the other fluid side will be lower than the
specified value.

(d) can’t tell