Which statement about the MODIFY operation is true?

• A. MODIFY changes only the COMMAND POSITION; Instruction Side information does not change.
• B. MODIFY updates all fields on the Edit Buffer Line.
• C. MODIFY changes the memory buffer contents.
• D. MODIFY affects the speed tag.

Answer: (A)

MODIFY updates only the coordinates of the command position, leaving the rest of the line unchanged. In the Edit Buffer, a line contains the command position plus other data such as Instruction Side information and a speed tag. When you apply MODIFY, the coordinates are rewritten, but the Instruction Side information stays as it was and the speed tag remains untouched. This focused change means you can tweak the position without altering how the line is interpreted or other settings. It also doesn’t replace the entire line or modify the underlying memory buffer content. So, the behavior that MODIFY changes only the command position while the Instruction Side information does not change is the true statement.