Use the following variable definition for the remaining questions in this section: .data MyByte SBYTE-A, -B, C, E MyWord WORD 7900h, 45000h, 66000h, 10000h a) For the following statements, state whether or not the instruction is valid. Give a comment to describe the reason why the instruction becomes valid or invalid. i) ii) mov ax, MyByte mov ax,MyWord (4 marks)