Final answer:
Customized enterprise resource planning (ERP) systems retain their standard features, while adding tailored functionality and specific integrations. Despite customizations, these systems generally still receive vendor support for the unmodified standard components.
Step-by-step explanation:
Business systems that are customized from commercial-off-the-shelf (COTS) enterprise resource planning (ERP) software aim to meet the unique needs of the organization. However, despite the customization, these systems generally still retain their original standard features. These features are part of the core software package developed by the vendor, which are designed to address the common needs across multiple businesses and industries. Thus, the core functionality provided by the ERP vendor is standardized across all installations of that product.
When a business opts to customize an ERP system, they do so to gain tailored functionality and specific integrations that work with their unique business processes and existing software ecosystem. Customizations may include modifications to the software's code, creation of custom modules, or integrations with other systems. Despite these changes, the underlying standard features remain available. Moreover, most vendors continue to provide vendor support for the standard components of the software, although extensive customizations may complicate support arrangements.
Therefore, in the context of the provided options, business systems that are customized from COTS ERP software generally do not lack vendor support. The correct answer to the student's question is d) Vendor support.