Is the expiatory payment for ẓihār acceptable when paid by feeding, or must the fasting for two consecutive months be completed?

The order in expiation for ẓihār is obligatory. One starts by freeing a slave. If unable to find one, then one must fast for two consecutive months. If unable to do so, then one must feed sixty poor persons. The fasting should be for two lunar months if one begins fasting at the start of the lunar month. Otherwise, one completes thirty days for the first month, then fasts for a full month, then completes the remaining sixty days from the third month. Any money given in lieu of fasting is not sufficient due to the obligation of following the prescribed order.