Which chip were the first RTC and CMOS RAM chip to be used in early IBM computers, capable of storing a total of 64 bytes?

Which chip were the first RTC and CMOS RAM chip to be used in early I

1.	Which chip were the first RTC and CMOS RAM chip to be used in early IBM computers, capable of storing a total of 64 bytes?
A.	the samsung 146818
B.	the samsung 146819
C.	the motorola 146818
D.	the motorola 146819
Answer» D. the motorola 146819