If a married couple chooses to file separate returns, which of the following is most likely true:$$a$.$both filers will be able to take the credit for child and dependent care expenses$$b$.$each filer$$s tax rate will be the same as it would have been had they filed a joint return$$c$.$the couple will pay more combined federal tax than they would have if they filed a joint return$$d$.$each filer$$s exemption amount for figuring the alternative minimum tax will be the same amount allowed for a joint return