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

D. 1 → D, 2 → A, 3 → B, 4 → C

OSI Model Layer	Responsibilities
1. Application Layer	A. Ensures data packets are delivered reliably
2. Transport Layer	B. Defines logical addressing and path determination
3. Network Layer	C. Converts digital data into electrical, radio, or optical signals
4. Physical Layer	D. Provides user interface and communication services
	E. Manages data frames and MAC addresses
	F. Controls and establishes communication sessions