Which of the following guidelines should be followed while giving constructive feedback?

A) Feedback should be given indirectly with the help of a middleman.
B) Feedback should be general and not specific.
C) Feedback should be elaborate and long.
D) Feedback should be given on all things the receiver can or cannot be expected to do.
E) Feedback should be given at a time when the receiver seems most willing to accept it.

Feedback should be given at a time when the receiver seems most willing to accept it. This ensures that the receiver is more receptive and open to listening to the feedback and working towards improvement. Options A and B are incorrect as feedback should be given directly and should be specific for the receiver to understand it better. Option C is also incorrect as elaborate and long feedback can lead to confusion and may not be easy to comprehend. Option D is incorrect as feedback should be limited to areas where improvement is necessary and not given on things that the receiver cannot control.