During February 2008, its first month of operations, the owner of Rutwing Enterprises invested cash of $25,000. Rutwing had cash revenues of $4,000 and paid expenses of $7,000. Assuming no other transactions impacted the cash account, what is the balance in Cash at February 28?

a. $3,000 credit

b. $22,000 debit

c. $29,000 debit

d. $18,000 credit