MT landlord provides written notice to a tenant holding a month-to-month tenancy that there will be a rent increase on may 1, on April 18. The tenant informs the landlord in writing of her intention to move at the end of the April rather than higher rent. Landlord insists to vacate the by april 25, who has provided required notice at termination of tenancy?

a) landlord

b) tenant

c) both

d) neither