Which of the following statements regarding the meaning of research are correct?

(a) Research refers to a series of systematic activity or activities undertaken to find out the solution of a problem.

(b) It is a systematic, logical and an unbiased process wherein verification of hypothesis, data analysis, interpretation and formation of principles can be done.

(c) It is an intellectual enquiry or quest towards truth.

(d) It leads to enhancement of knowledge.

Select the correct answer from the codes given below: