The $\_\_\_\_\_\_\_\_$ contains the data to be written into memory and receives the data read from memory.

Group of answer choices

A$.$ Memory Address Register $($MAR$)$

B$.$ Memory Buffer Register $($MBR$)$

C$.$ I$/$O Address Register $($I$/$O AR$)$

D$.$ I$/$O Buffer Register $($I$/$O BR$)$