The correct answer is: A. Crash time
The crash time is the shortest possible time to complete a task, but it requires additional resources and costs. The normal time is the amount of time it typically takes to complete a task. The optimistic time is the shortest possible time to complete a task, assuming everything goes perfectly. The pessimistic time is the longest possible time to complete a task, assuming everything goes wrong.
The minimum total project cost is achieved when the project is completed in the shortest possible time without exceeding the budget. This is usually the crash time, but it may be the normal time or even the optimistic time if the additional costs of crashing the project are not justified.
Here is a table that summarizes the different types of time:
| Type of time | Definition |
|—|—|
| Normal time | The amount of time it typically takes to complete a task. |
| Crash time | The shortest possible time to complete a task, but it requires additional resources and costs. |
| Optimistic time | The shortest possible time to complete a task, assuming everything goes perfectly. |
| Pessimistic time | The longest possible time to complete a task, assuming everything goes wrong. |
I hope this helps! Let me know if you have any other questions.