Which of the Following Is True of Non-Probability Sampling

Which of the following is true of non-probability sampling?

A) It is a set of procedures and processes for collecting, sorting, analyzing, and summarizing information on an ongoing basis.
B) It involves the use of arbitrary judgment by the market researcher to select a sample so that the chance of selecting a particular element of the population is either unknown or zero.
C) It is a hybrid of primary and secondary research conducted by a research company, spreading the cost across many clients to reduce the price.
D) It involves precise rules to select the sample so that each element of the population has a specific known chance of being selected.