discuss the differences between probability and nonprobability sampling in terms of main characteristics and pros & cons. 2. Please briefly explain four types of nonprobability sampling methods. 3. Please discuss the differences between validity and reliability. Use these references below with in-text citations. Bachman, R., & Schutt, R. K. (2021). Fundamentals of research in criminology and criminal justice(5th ed.). Sage Publications, Inc. Punch, K. F. (2016)