Please help! Correct answers only please! I need to finish this assignment before Friday. Given a student number system for a county requires that the student number be 6 characters.

The first 4 characters are any single digit number but no character can repeat and the last two characters must be a letter and letters cannot be the same. How many unique student numbers are possible?

A. 6,500,000

B. 3,276,000

C. 3,407,040

D. 6,760,000