If a broker$-$dealer is required to comply with both Reg BI and Rule $2111$ regarding a recommendation to a retail customer, compliance with Reg BI would result in compliance with Rule $2111.$ Why?

A$.$ because ALL broker$-$dealers are required to comply with both all the time.

B$.$ Because NO broker$-$dealers are required to comply with both.

C$.$ Because a broker$-$dealer that meets the best interest standard would necessarily meet the suitability standard.

D$.$Because NO ONE is required to comply with both.