Which of the following is true about sampling methods

(A). Probability sampling methods involve selecting samples from a population in a way that ensures every member of the population has an equal chance of being chosen. 

(B). In Systematic sampling every member of the population has an equal chance of being selected.

(C). In Voluntary response sampling Participants voluntarily choose to be part of the sample, leading to self-selection bias.

(D). In Snowball sampling Researchers select a predetermined number of participants from different subgroups to ensure representation, but the sample may not be random.