In a script, which of the following would indicate the start of a loop that continues while a condition is true?

In the context of scripting, the keyword 'while' is specifically designed to create a loop that continues executing its block of code as long as a specified condition evaluates to true. This is fundamental to control flow in programming.

When a script encounters a 'while' statement, it checks the condition provided immediately after the keyword. If that condition is true, the script will execute the code inside the loop. After completing the code block, it will reevaluate the condition, and if it remains true, the loop will execute again. This process will repeat until the condition evaluates to false.

The other choices pertain to different types of loop constructs or control flow. 'until' creates a loop that continues until a condition becomes true, which is fundamentally the opposite of 'while'. 'for' is used for iterating over a range or collection, and 'do' is typically used in conjunction with 'while' or 'until' to define the block of code that should execute during the loop. Therefore, 'while' is the most appropriate choice for indicating the start of a loop that continues based on a true condition.