On a typical night at a restaurant, the patio lights use 204.77 kilowatt-hours of electricity and the courtyard lights use h kilowatt-hours of electricity.

Which of the following expressions represents the total number of kilowatt-hours of electricity the patio and courtyard lights use?
A.
204.77 × h
B.
204.77 ÷ h
C.
204.77 - h
D.
204.77 + h

D. 204.77 + h