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A. 1 → A, 2 → E, 3 → C, 4 → D
B. 1 → B, 2 → A, 3 → E, 4 → F
C. 1 → D, 2 → F, 3 → A, 4 → C
D. 1 → C, 2 → B, 3 → D, 4 → E

A. 1 → A, 2 → E, 3 → C, 4 → D

Protocol	Function
1 HTTP (HyperText Transfer Protocol)	A Provides encrypted communication over the web
2 FTP (File Transfer Protocol)	B Assigns IP addresses dynamically to devices
3 DNS (Domain Name System)	C Translates domain names to IP addresses
4 SSH (Secure Shell)	D Securely connects to remote computers
	E Transfers files between client and server
	F Used for real-time video and audio streaming