Which of these regarding a SIMPLE is CORRECT?

A$)$

SIMPLE IRAs are subject to top$-$heavy rules.

B$)$

A SIMPLE requires actual deferral percentage $($ADP$)$ testing of employee elective deferral contributions.

C$)$

SIMPLE $401($k$)$s cannot offer retirement plan loans.

D$)$

A $25\%$ early withdrawal penalty may apply to distributions taken within the first two years of participation in the SIMPLE IRA plan.