Question: Which of the following statements regarding network protocols and their functions is correct?

A) The Hypertext Transfer Protocol (HTTP) operates over the transport layer and ensures the reliable delivery of web content through acknowledgment and retransmission of lost packets.
B) The Simple Mail Transfer Protocol (SMTP) is used for sending emails and operates at the application layer, facilitating the transfer of email messages between servers.
C) The Internet Control Message Protocol (ICMP) is primarily used for transferring data files across the internet and does not play a role in error handling or diagnostics.
D) The File Transfer Protocol (FTP) operates at the network layer, managing the routing of files between hosts and ensuring data integrity during transfer.