"The 'Hidden Curriculum' is a term used to describe the unwritten social rules and expectations of behaviour that we all seem to know, but were never taught" this definition of Hidden Curriculum has been given by?

"The 'Hidden Curriculum' is a term used to describe the unwritten social rules and expectations of behaviour that we all seem to know, but were never taught" this definition of Hidden Curriculum has been given by?
(a) Ralph Taylor
(b) L.R Gay
(c) Bieber
(d) All of above
✅ (c) Bieber
Explanation: Bieber defined hidden curriculum as the unwritten social rules learned informally in schools.