What type of affix attaches to both the beginning and the end of a root?

The correct response refers to circumfixes, which are unique in that they consist of two parts: one that is attached to the beginning of a root and another that is attached to the end. This dual attachment allows circumfixes to modify the meaning of the root word in a way that neither a prefix (which only appears at the start) nor a suffix (which only appears at the end) can accomplish independently.

For example, in some languages, circumfixes may indicate grammatical aspects like tense or mood by sandwiching the root between two affixes. This distinguishing feature of covering both ends of the root is what makes circumfixes particularly interesting and essential in morphological study. In contrast, the other types of affixes mentioned serve only a single positional function, either at the beginning or the end of the root word, restricting their ability to create the comprehensive modifications that circumfixes achieve.