Correct Option: A

Voice-mail (also known as voicemail, voice message or voicebank) is a computer based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone. Voicemail systems were developed in the late 70’s by Voice Message Exchange (VMX). They became popular in the early 80’s when they were made available on PC-based boards. Voice mail was the brainchild of Gordon Mathews, a successful entrepreneur who held 35 US and foreign patents at the time of his death on February 23, 2002.