MEMORANDUMTo: All staffFrom: Brian Candler （B.Candler@pobox.com) Delivery date: Mon, 28 Ma

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.

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