3. A Telephone is an example of which system? (A) Half duplex (B) Full Duplex (C) Simplex 4. A building announcement system is an example of which system? (A) Half duplex (B) Full Duplex (C) Simplex Mo 5. The following bytes are transmitted as the payload of a frame 55 7E 98 CE OF 5E. Show the complete frame using byte count framing. 6. In question # 5, the FLAG byte is 7E and the ESC character is 98. Show the complete frame using Byte stuffing. 7. A bit string payload, 0111111011111011110, needs to be transmitted at the data link layer. What is the string payload actually transmitted after bit stuffing? (A) 011110111110011111010 (B) 011111010111110011110 (C) 0111110101111100111100 (D) 0111111011111011110 (E) None of the above