The correct answer is:

2 and 3

Statement 1: The Headquarters of the International Organisation for Standardization (ISO) are located in Rome.

This statement is incorrect. The Headquarters of ISO are not located in Rome. The International Organisation for Standardization is based in Geneva, Switzerland.

Statement 2: ISO 9000 is related to the quality management system and standards.

This statement is correct. ISO 9000 is a series of standards that focuses on quality management systems. It provides guidelines and criteria for organizations to ensure that they meet customer requirements, enhance customer satisfaction, and continuously improve their processes.

Statement 3: ISO 14000 relates to environmental management system standards.

This statement is also correct. ISO 14000 is a series of standards that focuses on environmental management systems. It provides guidelines for organizations to establish, implement, maintain, and improve their environmental management practices.

Therefore, the correct answer is:

2 and 3