What is a string?

This choice describes an algorithm or a procedure rather than a string. An algorithm consists of a defined sequence of operations or steps to accomplish a specific task, whereas a string is simply a representation of characters and does not involve procedural instructions.

This option describes a variable rather than a string. A variable is a named storage location that can hold different types of values, including strings, but the term "string" specifically refers to the sequence of characters themselves, not to the name or identifier for any value.

This choice refers to functions or procedures provided by a programming language that perform specific tasks, which is different from a string. Built-in methods are used to manipulate strings or other data types, but they are not strings themselves; rather, they operate on string values.