Final answer:
The true statement regarding ERP systems is that they can be modified using add-on software. They are not infinitely scalable, and performance issues can be due to both technical and business process challenges.
Step-by-step explanation:
The true statement here is that ERP systems can be modified using add-on software. ERP systems, or Enterprise Resource Planning systems, are designed to integrate various business processes and functions into a unified system. Although they are scalable, they are not infinitely so, as there are always technical, practical, or financial limitations.
Performance issues with ERP systems are often related to both technical and business process issues. It's important to note that reengineering business processes can be complex and challenging. The idea that a single ERP can handle all problems an organization may face is unrealistic. Usually, an ERP system needs to be carefully selected and customized to fit the specific needs of an organization.