Which of the following is a type of Non-probability sampling?

The correct answer is Option (2) → Voluntary response Sampling

$\text{Stratified Sampling} \;\Rightarrow\; \text{Probability sampling}$

$\text{Cluster Sampling} \;\Rightarrow\; \text{Probability sampling}$

$\text{Simple Random Sampling} \;\Rightarrow\; \text{Probability sampling}$

$\text{Voluntary Response Sampling} \;\Rightarrow\; \text{Non-probability sampling}$

The correct answer is Voluntary Response Sampling.