Answer:
The correct answer is:
Properties (D)
Explanation:
First of all, option D (Properties) is the option that makes the most sense in this scenario, because the other options: Copy, Delete, and Rename are unrelated commands to what is to be achieved.
Secondly and more practically, an add-in file may not load in excel, and most of the time it is blocked by default and has to be unblocked. The following steps are used:
1. close Excel if it is open
2. open the folder where the add-in file is located, right-click on the add-in file, and select "properties"
3. a display tray will appear, having the attributes: Read-only, Hidden, Advanced, and unblock. Click the checkbox against "unblock" and make sure it is checked.
4. click Apply and Click Ok
Voila, your add-in file is unblocked.
<em>N:B The Images are for steps 2 and 3</em>
