Opcode Definition Halt ADD SUB STA STORE LDA LOAD BRA BRANCH UNCONDITIONALLY BRZ BRANCH ON ZERO BRP BRANCH ON POSITIVE IN INPUT OUT OUTPUT 901 902 Please refer to this table of Mailboxes and Contents for pro Mailbox d Contents for problems 6 through 7 00 01 03 Contents 505 106 507 902 000 DAT 1 DAT 3 DAT 6 04 15 une value in the calculator after the fourth instruction (902) is completed a. 1 b. 2. c. 3 d. 6 e. None of the above 7. What is the value in location A after the program is complete? a. 1 b. 2 c. 3 d. 6