What defines the root in a line of instruction?

• A. The last element
• B. The first element in a line of instruction (MOV_, TIMER, DOUT, etc.)
• C. A separate header line
• D. The memory content

Answer: (B)

The action to perform on a line is determined by the first token—the root. This first element tells the system which operation to execute (for example, MOV to move to a position, TIMER to wait a duration, DOUT to drive outputs). The rest of the tokens on the line serve as operands or parameters that the root operation uses to carry out that action, such as coordinates, values, or addresses. The memory content is just data that might be used by the command, not what defines the command itself. A separate header line isn’t part of the per-line root instruction, so it doesn’t define the operation either.