A married couple with only one spouse currently working outside the home plans to retire in several years. An annuity that would be particularly suitable for saving for that retirement would be:_________
a. a straight life annuity on the life of the working spouse,
b. a straight life annuity on the life of the nonworking spouse,
c. a deferred joint and survivor annuity,
d. an immediate joint and survivor annuity.