A critical task is typically defined as a task that is essential to the completion of a project, meaning that any delay in its completion will directly affect the overall timeline or delivery of the project.
Given the options you provided:
- Items that will delay the task (A) - This indicates factors that could impede the progress of the task.
- Items which can be done as time and resources permit - These are not critical because they are not essential for the task's completion.
- Items which are important to the timing of the task (C) - These items are critical as they directly influence when the task can be completed.
Therefore, the correct answer would be: Both A and C.