Which character encoding directly supports high-level character representation?

The correct choice for character encoding that directly supports high-level character representation is UTF-16.

UTF-16 is designed to encode a wide range of characters from various languages and symbol sets, making it suitable for high-level character representation. This encoding allows for the representation of characters beyond the limited range of traditional ASCII, which is confined to 128 characters primarily for English letters and basic punctuation. UTF-16 can encode characters using one or two 16-bit code units, accommodating a vast array of symbols, including those used in languages like Chinese, Japanese, and Arabic. This flexibility makes UTF-16 ideal for applications requiring internationalization and support for various languages and scripts.

ASCII mainly provides support for English characters and basic control characters, making it less suitable for high-level character representation in diverse linguistic contexts. Binary and Hexa are not character encodings per se; rather, they are number systems used for expressing data in computing contexts. Thus, UTF-16 stands out as the encoding that meets the needs of high-level character representation, accommodating the complexities of languages and symbols used in global communication.