It is required to add 56KB of memory to an 8088 microprocessor based system which has 20-bit address and 8-bit data buses in the following address ranges: 4 (8Kx8) RAM chips to decode from start address A0000H. 2 (4KxS) RAM chip to decode from start addresses A8000H. 1 (16Kx8) RAM chip to decode from start addresses AA000H. What is the address space for the second 4Kx8 RAM? O a. A8000 - ABFFF O b. A8000 - A9FFF O C. A9000 - A9FFF O d. A7000 - A7FFF