Question: What type of clock may DS-TT and NW-TT support as defined in IEEE Std 1588, in addition to Boundary Clock and End-to-End Transparent Clock?
Option 1: Peer-to-Peer Transparent Clock
Option 2: PTP Relay instance
Option 3: Master Clock
Option 4: Slave Clock
Explanation: According to the text, DS-TT and NW-TT may support the following PTP instance types: Boundary Clock, End-to-End Transparent Clock, Peer-to-Peer Transparent Clock, and PTP Relay instance. Therefore, the correct answer is Peer-to-Peer Transparent Clock.