Which of the following is true regarding delegation? A. The principle of delegation relates to the process of committing an activity to another's care. B. It is closely related to the principle of span of control in that even though the span is excessive, the harm from it can be reduced by the delegation of much detail to subordinates. C. Those supervisors who refuse to allow anything to be done except under their direct control are the primary causes of the crippling bottlenecks that slow or stop effective operations. D. All of the above