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

How to ask for a letter of recommendation through email
Confirm the application requirements.
If you're going to ask for a letter of recommendation, you need to double check where it's going. Since letters are often expected to be kept confidential, the recipient of your request will need to know where to send the letter of recommendation; the last thing you want is to give them incorrect information.

Pick from: I. Write your letter if the information will be ambiguous. If you're not sure if your recipient will read it, consider writing your letter first to avoid inadvertently giving them false information.. II. Ask in person if you can use their email address. Ask if their professor knows the check request site (p.o.) where the letter should go.. III. Also, once you find out they already have a letter of recommendation, they cannot refuse to send it. If there are some requirements or guidelines in place that warrant your request, make sure that those rules are understood.. IV. Also make sure to double check the application deadlines. If the letter of recommendation needs to be mailed, you should consider providing the recipient with a pre-stamped, pre-addressed envelope..
The answer is:
IV.