Answer :
The given statement is in the Present perfect progressive tense.
What is progressive tense?
A ongoing activity or situation is referred to as being in the progressive tense of a verb. In English, a progressive tense verb form consists of the primary verb's present participle and a variation of the word "be."
The present, past, future, present perfect, past perfect, and future perfect are the six progressive tenses. The progressive tense is sometimes referred to as the progressive aspect of a verb by grammaticians. The progressive tense conveys the action indicated by the verb as "ongoing."
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The students have been instructed to be on their best behavior is what tense