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

C. 1 → C, 2 → D, 3 → A, 4 → B

OSI Model Layer	Functions
1. Physical Layer	A. Handles logical addressing (IP addresses) and routing
2. Data Link Layer	B. Ensures reliable communication, error detection, and flow control
3. Network Layer	C. Converts data into signals and transmits them over media
4. Transport Layer	D. Defines physical addressing (MAC addresses) and manages data frames
	E. Encrypts data and manages authentication
	F. Manages session establishment and termination between applications