Correct option is A
In the 8051 microcontroller, pin 30 (ALE - Address Latch Enable) is used to control the demultiplexing of the address and data bus.
· The 8051 microcontroller uses a multiplexed address/data bus to save pins.
· The ALE signal is generated to latch the lower byte of the address (from Port 0) into an external latch, allowing the same pins to be used later for data transfer.
