Riley participates in his employer's 401(k) plan. He turns 70 years of age on February 15, 2018, and he plans on retiring on July 1, 2020. When must Riley receive his first distribution from the plan to avoid minimum distribution penalties?

which date is correct

By April 1, 2018.

By April 1, 2020.

By April 1, 2021.

By April 1, 2019.