Leslie is teaching an acting class and has a spreadsheet to keep records for the class. There's a single column containing both first and last initial for each student, a

column containing the corresponding ID number for each student, and a column containing each student's course average. Suppose $K,M,$ and $C$ are variables

representing initials, ID numbers and course averages in Leslie's spreadsheet, respectively.

Given that the following are all true:

There are students named Matthew Kennedy and Megan Keys in Leslie's class $($and all other students have different initials$).$

No two students have the same ID number.

No two students have the same course average.

Which of the following statements could be true based on the information given? $($check all that apply$)$

A$.M$ could be a function of $C$

B$.K$ could be a function of $C$

C$.C$ could be a function of $M$

D$.K$ could be a function of $M$

E$.$ None of these could be true