The setInterval() method returns a unique interval ID. To stop the execution of the function specified in setInterval(), you must call the clearInterval() method. This method requires the interval ID returned by setInterval() as its only argument. In the provided code, timerId holds this unique ID, making clearInterval(timerId) the correct statement to cancel the timer.

B. removeInterval(timerId); is incorrect because removeInterval is not a standard function in the JavaScript WindowOrWorkerGlobalScope mixin for handling timers.

C. removeInterval(timedFunction); is incorrect for two reasons: the function name removeInterval is wrong, and the argument should be the timer ID, not the function reference.

D. clearInterval(timedFunction); is incorrect because the clearInterval function requires the interval ID as its argument, not the function that was scheduled to run.

1. MDN Web Docs, WindowOrWorkerGlobalScope.clearInterval(). "The clearInterval() method of the WindowOrWorkerGlobalScope mixin cancels a timed, repeating action which was previously established by a call to setInterval()." (Section: Syntax, clearInterval(intervalID);)

2. MDN Web Docs, WindowOrWorkerGlobalScope.setInterval(). "The returned intervalID is a numeric, non-zero value which identifies the timer created by the call to setInterval()... This value can be passed to clearInterval() to cancel the interval." (Section: Return value)