Which type of permanent policy is known for allowing the policyowner to adjust the premium amount and the death benefit within limits after issue?

解析

Universal life is a flexible-premium, adjustable death benefit policy: the owner can vary the timing and amount of premiums and can increase or decrease the death benefit (subject to insurer rules and possible evidence of insurability). Level term has fixed premiums and a fixed benefit for the term. A single premium immediate annuity is not life insurance at all; it converts a lump sum into an income stream. Traditional whole life has a fixed, level premium and a fixed face amount, which is exactly the rigidity universal life was designed to overcome.