On May 31, the Cash account of Bottle's R US had a normal balance of $5,800. During May, the account was debited for a total of $13,000 and credited for a total of $12,300. What was the balance in the Cash account at the beginning of May?

a. A $5,100 debit balance.

b. A $5,100 credit balance.

c. A $6,500 credit balance.

d. A $6,500 debit balance.

e. A $0 balance.