Which polymer contains an ester linkage

The same question, asked 2 times: 11 May 2023 S1*, 15 Apr 2026 S1. Every wording below, oldest first.

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Question 1
11 May 2023 S1
81 $Which from following polymer contains ester linkage?$
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Question 2
15 Apr 2026 S1
48 $Which of the following polymers has ester linkage?$
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