Final answer:
The thread assembly of PVC and CPVC joints is best performed using Teflon tape, lubricants, and thread sealant to ensure a leak-free and durable connection.
Step-by-step explanation:
When assembling threaded PVC and CPVC joints, the types of materials recommended include A) Teflon tape, B) Lubricants, and C) Thread sealant. Each of these serves a specific purpose in ensuring a water-tight and durable connection. Teflon tape, also known as PTFE tape, is used to seal the threads and prevent leaks, while lubricants can make it easier to tighten the joints without damaging the threads. Thread sealants, which are often paste-like compounds, can further help to prevent leaks by filling in any gaps between the threads.