Which one of the following is a true statement regarding a "benefit period" under Medicare Part A$?$

A$)$

A benefit period begins when an individual receives a Medicare$-$covered service as an inpatient in a hospital.

B$)$

A new benefit period begins each January $1$ and continues for one calendar year.

C$)$

A benefit period ends when an individual has been out of the facility for $45$ days.

D$)$

If an individual is readmitted to the hospital after he or she has been out for $30$ days or more, a new benefit period begins.