One of your staff members has been asked to give two speeches. Details are as follows: • first speech - large target audience; objective: to inform them of company progress over the past year; and • second speech - small group of staff in the marketing department; objective: persuasion. insert memorandum in correct format to your staff member and give him detailed advice on the best audio-visual aids to use for each speech in order to enhance his presentation. 

Explain the reasons for your choice and also how he should use these aids to the best advantage?