When listing of population is not possible, interviews are given from exact number of quotas form persons, it is called?

When listing of population is not possible, interviews are given from exact number of quotas form persons, it is called?
(a) Convenience sampling
(b) Systematic sampling
(c) Quota sampling
(d) Purposive sampling
✅ Correct option: (c) Quota sampling
Explanation: Quota sampling ensures specific proportions (quotas) from a population without full listing.