【单选题】

life cycle costing is the total cost to the customer for the acquisition and ownership over its full life. life cycle costing categories include the cost

of _____, _____, and _____.
a. r & d, maintainability, operation and support.
b. r & d, production, operation and support.
c. acquisition, operations, maintenance.
d. production, operations, maintenance.
e. none of the above