Which insertion mode should be chosen to add new elements to the right of the currently selected instruction?

The appropriate choice for adding new elements to the right of the currently selected instruction is APP (Append) mode. This mode is specifically designed for appending new instructions or data at the end of the current selection, ensuring that existing instructions remain unaffected while new elements are seamlessly inserted to the right.

Inserting via the APP mode allows for an efficient way to expand a program's functionality without the risk of overwriting or altering existing code. This is particularly useful in programming environments like Rockwell's ControlLogix, where maintaining the integrity of existing logic is crucial while still allowing for ongoing development and enhancement of the project.

Other modes such as Insert Mode might suggest an insertion process but do not guarantee that elements are added specifically to the right, while Overwrite Mode replaces existing instructions rather than adding to them. Copy Mode, on the other hand, is used to duplicate existing elements rather than create new ones. Thus, APP mode is ideally suited for the task of appending new instructions in a structured and organized manner.