External data memory -Reason for slow speed accessibility

Q.  Why is the speed accessibility of external data memory slower than internal on-chip RAM?
- Published on 06 Nov 15

a. Due to multiplexing of lower order byte of address-data bus
b. Due to multiplexing of higher order byte of address-data bus
c. Due to demultiplexing of lower order byte of address-data bus
d. Due to demultiplexing of higher order byte of address-data bus

ANSWER: Due to multiplexing of lower order byte of address-data bus

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