The process in which annuitant can keep annuity contract in the accumulation phase and take withdrawals as needed instead of converting it into income.

Partial withdrawals allow the annuitant to keep the contract in the accumulation phase and take withdrawals as needed, which is exactly what the question describes. Full withdrawals would typically mean liquidating the entire contract. 'All the above' is incorrect because full withdrawals is a different concept. Partial withdrawals provide flexibility while keeping the annuity active.