Final answer:
The method of sending and receiving messages referred to in the question is Email, which plays a key role in modern communication by allowing individuals to correspond over long distances efficiently and effectively, without needing to travel.
Step-by-step explanation:
The method of sending and receiving messages through a network that is being referred to in the question is Email (option A). Email has become a very important means of communication among various groups, such as friends, club members, student or volunteer groups, as well as teachers and students. It allows for the exchange of messages and information over a computer network, typically the internet. Unlike instant messaging, which is often used for real-time, quick communications, or VoIP (Voice over Internet Protocol), which is used for Internet-based calling and video calling, Email is typically used for less immediate, more formal correspondence. On the other hand, FTP (File Transfer Protocol) is used for transferring files rather than sending messages.
Since the mid-1990s, the use of Email has grown tremendously, fueled by improvements in technology that allow for cheaper, faster, and better-quality data transmission. The internet has facilitated the global spread of information, and the creation of social networks. Email communication plays a vital role in this connectivity, allowing people to maintain contacts across long distances without the need for travel, making the world more interconnected.