An event procedure is a block of code that is executed in response to an event, such as a button click or a form load. When an event is triggered, the event procedure is called and passed certain parameters that provide information about the event.

The parameters that are found in an event procedure may vary depending on the programming language or platform being used, but they generally include the following:

A. e - This parameter represents the event arguments, which provide information about the event that was raised. It may include properties such as the name of the control that raised the event, the type of event, and any additional data associated with the event.

B. Sender - This parameter represents the object that raised the event. It is typically used to identify the control or component that triggered the event.

C. Receiver - This parameter is not commonly found in event procedures, but it may refer to the object or component that is listening for the event.

Therefore, the correct answer is E, all of the above. Both parameter e and Sender are commonly found in event procedures, and in some cases, Receiver may also be present.