Correct Answer : Option (B) : IN, OUT
Explanation : The address of the input/output port may be specified directly or indirectly.
Example for input port: IN AX, DX; This instruction reads data from a 16-bit port whose address is in DX and stores it in AX
Example for output port: OUT 03H, AL; This sends data available in AL to a port whose address is 03H.
