The relevant sentence in the passage is: Plastic boards are usually called PE (polyethylene) cutting boards, or HDPE (high-density polyethylene plastic), the material of which these boards are made.is the reasoning for what question and answer pair?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: Plastic boards are usually called PE (polyethylene) cutting boards, or HDPE (high-density polyethylene plastic), the material of which these boards are made. There are basically two types of HDPE boards being made. One version is made from injection-molded plastic, while the other is HDPE from an extrusion line.

Based on this passage, what type of plastic are cutting boards made from?
A: HDPE ( high - density polyethylene plastic )