Which of the Following Statements Is True with Regard to Schedule

Which of the following statements is true with regard to schedule efficiency and budget efficiency?

A) Schedule efficiency refers to how closely the project's progress is tracking relative to the best-case scenario for project completion.
B) Budget efficiency is the efficiency with which budget is being used relative to the best-case scenario for project costs.
C) Schedule efficiency refers to how closely the project's progress is tracking relative to its original plan.
D) Budget efficiency is the efficiency with which budget is being used relative to the worst-case scenario for project costs.