Which of the following statements best describes the post-audit function in the capital budgeting process?

a. The post-audit should be performed before a purchase decision is made for a new capital budgeting project.

b. The results of a post-audit generally can be used to develop future cash flow forecasts for new capital budgeting projects that are 100 percent accurate.

c. The post-audit involves comparing the actual results of previous capital budgeting decisions with the forecasted results to identify and explain any differences.

d. Because it is quite expensive to perform, the post-audit should always be considered a voluntary part of the capital budgeting process.

e. The post-audit is a fairly simple process, primarily because it is easy to separate the operating results of one project from those of other related projects.