Questions 13 - 16 are based on the vertical timeline(vertical time sequence diagram) shown below. Each number indicates a certain time interval within the overall exchange of two messages between hosts A and B across a single link. Interval 1 begins when the first bit of Message 1 is transmitted by host A. Host A Host B O 6 O 3 04 1. O 5 2. 3. 4. 5. 6. Which time interval represents the propagation time (delay) for Message 2? Message 1 Message 2 Question 14 Which TWO time intervals (numbered to the left of the figure) must be equal whenever the send and receive paths are the same (assume constant network conditions)? O 3 and 5 O 1 and 2 O2 and 4 6 O 5 and 6