If a teacher is not able to answer a question raised by a student in the classroom, he should

Promising to answer after consultation is honest and ensures a correct reply once the teacher has checked the facts.

Rebuking the student punishes legitimate curiosity.

Trying to manipulate the students is deceitful and erodes trust.

Feeling shy of one's ignorance is needless, since no one can know everything.

Intellectual honesty strengthens a teacher's credibility.

A teacher who keeps learning models lifelong learning for students.