A. Caps lock - कैप्स लॉक
B. Scroll lock - स्क्रोल लॉक
C. Insert - इन्सर्ट
D. All of the above - उपरोक्त सभी
A which work line ON/OFF i.e. which used to enable and disable known as Toggle Key.
Example Caps Lock key used for Both Caps On and Off.