18 Given that Si contains 0050H. If after executing the instruction MOV [SI], AH the content of AH is stored at the physical memory address F0050, so find the content of the data segment register DS before and after executing? * (1 Point) Before=F000H, After=F000H Before=0050H, After=0050H Before=F0000H, After=F0000H Before=0050H, After=FOOOH Before=FOOOH, After=0050H None 19 What is the value of SP after executing the 19 What is the value of SP after executing the following code? (2 Points) MOV SP, 6243H MOV CX, 9DBFH NOT SP XOR CX, SP TEST: POP AX LOOP TEST NOP ; no operation SP = 9DC4H SP = 6245H SP = 9EDCH SP = 9DBCH SP = 9DC2H SP = 9CDEH None