Question 21 6 Points Four channels are multiplexed using synchronous TDM. The rate of each channel is given by 500 kbps and we use 2-bit units. provide a step-by-step calculation for the following 1. Input bit duration 2. Input unit rate 3. Output frame rate 4. Output frame size Use the editor to format your answer Question 10 05 Points Which of the following is a data link layer function? Framing B Error control Access control All the above