A flexible-premium annuity is always a:

解析

A flexible-premium annuity is funded with a series of payments made over time, which necessarily requires an accumulation period, so it must be a deferred annuity. An immediate annuity is funded by a single lump sum and begins paying right away, so it cannot accept flexible ongoing premiums. Being variable or fixed describes how funds are invested, not the payment timing. Any contract that accepts ongoing deposits is deferred by definition.