单选题 Questions 175-176 refer to the following memorandum.

To: All staff
From: Brian Candler (B.Candler@pobox.com)
Delivery date: Mon, 28 May 2007, 13:47:03
Subject: Long-distance calling instructions
Next month, there will be an important change to the way we make long-distance telephone calls. This should help provide extra security for our telephone systems. Your authorization number will go from four digits to five digits in length. A "3" will be added to the start of your authorization number. For example, if your number was "1234" , it will change to "31234" . Remember that if you have automatic telephones or fax machines, they will have to be reprogrammed.
* The authorization number is not necessary when making local calls.

单选题 Why is the change outlined in this memo made?
A. To reduce costs
B. To adapt to a new phone system
C. To increase the security of the communication system
D. To provide automatic dialing

单选题 What change is NOT stated in the memo?
A. The change will take place next month.
B. Phones may need to be reprogrammed.
C. Authorization numbers will be made longer.
D. Local calls will require an authorization number.