What does IMAP4 stand for?

IMAP4 stands for Internet Mail Access Protocol version 4. It is a protocol used by email clients to retrieve messages from a mail server. It allows users to access and manage their emails on the server without needing to download them to a local device, enabling functionalities like organizing emails into folders and keeping messages synchronized across multiple devices. The "version 4" indicates that this is the fourth iteration of the protocol, which includes various improvements over previous versions, such as better support for folder manipulation and message status updates.

The correct option emphasizes its role in internet-based email access, highlighting its relevance in modern email communication. Other provided options do not accurately reflect the purpose or the full name of the protocol, failing to convey its essential features and specifications.