What must be true for initial programming on the Address Side?

For initial programming on the Address Side, it is essential that the cursor is active on that side. The Address Side is where specific addresses are designated for operations or data storage, and having the cursor active there enables the user to input or modify addresses as required. This functionality is crucial because if the cursor is not on the Address Side, any input will be directed to the Instruction Side or elsewhere, leading to potential errors in programming and the inability to properly assign addresses.

When the cursor is active on the Address Side, it allows for precise control over the addresses being programmed, ensuring that the system will function correctly when it executes instructions that rely on those addresses. This aspect is foundational for correct and efficient programming in systems where memory addressing and instructions are separated.

The other options do not accurately describe the necessary conditions for initial programming on the Address Side, as they do not address the requirement of cursor location and its impact on the input process.