A contractor enters into a contract to build a house for a new homeowner. The contractor will provide overall management of the project and various other services, including architectural design, site preparation, construction, and plumbing and electrical services. The contractor regularly sells these services individually to customers. Which choice correctly lists the performance obligations that should be in the contract?

a. One combined performance obligation for the bundle of the project management services, architectural design, site preparation, construction, and plumbing and electrical services

b. Project management services

c. Project management services and a material right related to the option to purchase the various other goods and services

d. Project management services, architectural design, site preparation, construction, and plumbing and electrical services