One word for 'one who betrays his country' (traitor)

The same question, asked 2 times: 19 Jul 2023 S1*, 25 Sep 2024 S3. Every wording below, oldest first.

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Question 1
19 Jul 2023 S1
86 $Select the option that can be used as a one-word substitute for the given group of words. Person who betrays his own country.$
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Question 2
25 Sep 2024 S3
78 $Select the most appropriate option to substitute the underlined segment in the given sentence. The betrayer of the country was at last unmasked.$
Tap an option to check your answer.