Although Mallory became totally disabled on June $1,$ her disability insurance policy did not begin paying benefits until August $1.$ Which statement correctly describes the reason why benefit payments were delayed?

A$)$ Mallory's policy covers long$-$term disabilities only.

B$)$ Mallory's policy contains a coordination of benefits provision.

C$)$ Mallory's policy contains a $60-$day probation period.

D$)$ Mallory's policy contains a $60-$day elimination period.