If a seminar or conference is being conducted in your city concerning education, what will you do?

Select the alternative which consists of positive factors contributing to the effectiveness of teaching:
List of factors:
(a) Teacher's knowledge of the subject.
(b) Teacher's socio-economic background.
(c) Communication skills of the teacher.
(d) Teacher's ability to please the students.
(e) Teacher's contact with students.
(f) Teacher's competence in managing and monitoring classroom transactions.
Codes:

Research has shown that the most frequent symptom of nervous instability among teacher is: