What is the default character encoding for JSON text per RFC 4627?
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Correct answer: UTF-8.
Why this is the answer
UTF-8 is the default character encoding for JSON text as specified in RFC 4627. This standard ensures interoperability across different systems and platforms by providing a universal encoding that can represent all characters in the Unicode character set. While JSON parsers may support other encodings like UTF-16 or UTF-32, UTF-8 is the mandatory default. UCS-2 is an older, fixed-width Unicode encoding that is a subset of UTF-16 and doesn't support all Unicode characters. GB18030 is a Chinese national standard character encoding, not a general JSON default. Hexadecimal (Hex) is a number system, not a character encoding.
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