Math question, please help me?

The explicit rule for a sequence is given.
an = 4n − 1
What is the recursive rule for the sequence?
 
A) a1 = 3; an =an − 1 + 4

B) a1 = 3; an = an − 1 − 1

C) a1 = 4; an = an − 1 − 1

D) a1 = −1; an = an − 1 + 4

 

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Thank you to anyone who helps!