单选题
From: Bob Foster, IT Director To: Carrick Jones, General Manager Hi, Carrick, We need to (28) the anti-virus software on all the office computers. As you're .probably aware, computer viruses are constantly evolving and changing. To keep our IT secure, we need to have the latest software. It will take several hours to install these programs, which could be very disruptive to the work schedule. Accordingly, I think the best way of (29) this task is to install' the programs over the weekend, when everyone is out of the office. The technicians in my team are happy to work on either Saturday or Sunday. However, they expect to be (30) with an additional day of leave. I told them I would check with you whether this was possible. Please get back to me as soon as you can so that I can confirm these plans. Regards, Bob Foster