OF KNIGHTS AND KNEIGHVES

The waters were calm and breeze balmy the morning Twilight Sparkle finally spied, dropped anchor at, and dinghied up to the island whose fascinating social customs had filled her fillyhood with countless evenings of logical recreation.

Here she finally was: The Isle of Knights and Knaves she'd read so much about. "But I always thought it was just an old ponytale. Could the accounts really be true after all?" Sure enough, as she scaled a bank of sand, a disambiguating sign rose into view to welcome anypony passing into town.

The sign, which was comprised of a banner hung between the two oldest palms, marked a population of a thousand and one. "Tough task ahead I face," she sang to shake off her nerves before as it happened actually bumping into one such member of the populace.

Twilight would later insert here, for the convenience of her readers (and perhaps to distract from her little faux pas), rules with which she had already been long familiar: that unlike Equestria, which contained ponies of infinite habits and attitudes, this small island-nation's inhabitants were all either knights, who always told the truth, or knaves, who always lied.

Now Twilight had had much time to think about what she would say in just such a scenario, and she had come up with a very curious question.

Twilight asked, "Will you reply as a knight would reply in answer to this question?" to which the native responded either "yes" or "no."

Could Twilight tell if the native was a knight or a knave? If so, which?