After a tenant gave notice and vacated an apartment, the landlord discovered substantial damage to the unit. No time was set in the lease specifying the length of time the landlord had to account or refund the security deposit after deductions. Which of the following is an appropriate action by the landlord?
a. return the deposit immediately and bill the tenant for the repairs when completed
b. if the damage is obviously more than the deposit, the landlord may keep the damage deposit without notice
c. notify the tenant that his or her damage deposit is forfeited within 60 days
d. itemize the damage in writing and return any excess deposit within one month