Which of the following is the correct syntax for a comment in JavaScript?

The correct syntax for a comment in JavaScript can be represented in two forms: single-line comments and multi-line comments. Single-line comments begin with a double forward slash (//), and everything following the slashes will be considered a comment until the end of that line. Similarly, multi-line comments start with a forward slash and an asterisk (/) and end with an asterisk and a forward slash (/), and they can span multiple lines.

The selected answer, which is a single-line comment that starts with "//", is indeed correct because it adheres to the proper syntax for single-line comments in JavaScript. It conveys that the entire line following the "//" is a comment and will be ignored by the JavaScript interpreter. However, it's worth noting that while this answer is a valid example of a comment, it is one of multiple valid expressions of JavaScript comments, including those that may have different content.

Other choices include valid forms of comments as well but only demonstrate variations in content rather than structure. For instance, while one option uses "/* ... */" for multi-line comments, another option provides the correct single-line format. The important takeaway is that the format with "//" is specifically correct for representing single-line comments in Java