This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to send an email at a specific time in the future using mozilla thunderbird
Download thunderbird 3.1 + version of the extension.
You will need to save it your hard disk and then install it from thunderbird extension manager.
Instructions for installing :
Right click on the link and choose " save link as..." or " save target as...".

pick from the following.
[1]. Choose " all current default, " " current cache grade ". There are not many of the possible options, but if you like what you see, save it in your default cache grade.
[2]. Choose a file path on your hard disk. [ desktop/home folder is fine too].
[3]. Click " format document explorer " as the answer. A new window will pop up, which is where you can delete the document.
[4]. On the part where you added the target, click " save package " or " save link to...". Right click " save file " or " save as ".
The answer is:
[2].