Students should check all of the following before requesting letters of recommendation except:

a. who may be a recommender.
b. how many letters each school requires.
c. when the deadline is.
d. what type of font to use.

D). What type of font to use.

Explanation:

As per the question, the students need to consider all of the given points except the 'type of font' before requesting letters of recommendation as it would not affect the content or efficacy of the letter.  

A recommendation letter must have a formal and humble opening that would help create a positive impact. It must be written by considering 'who is the recommender' and the letter needs to be framed accordingly. Then, the information of required no. of letters for each school and about the deadline so that he/she may apply on time. Thus, option D is the correct answer.

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