单项选择题

McKinsey Consulting Co.
MEMORANDUM
To: Department Managers
From: Hank Williams
Date: April 15
Subject: Workshops
Our computer database programs will be upgraded as of May 1st. For this reason, we will be hosting a training workshops for our employees. Below are the dates for the workshop, which will be led by George Webster, our computer department manager. All McKinsey Consulting"s employees are required to attend their department respective session to receive updates on relevant updating procedures in our computer lab. If you have any schedule conflicts with this workshop, please contact me as soon as possible in order to revise the workshop schedule accordingly.

DAY/DATE	TIME	DEPARTMENT
Monday/April 20	9:00 A.M.-2:00 RM.	Human Resources
Tuesday/April 21	10:00 A.M.-3:00 RM.	Accounting
Wednesday/April 22	9:00 A.M.-2:00 RM.	Consulting
Thursday/April 23	10:00 A.M.-3:00 RM.	Maintenance
Friday/April 24	9:00 A.M.-2:00 P.M.	Marketing

On what date would Mr. Garrison like his department"s session to take place