What is the most likely system acquisition method—commercial software, custom software, or ERP—for each of the following situations? Explain your answers.

• A heating and air-conditioning supply company with 20 employees that sells standard off-the-shelf products to wholesale customers in a local community needs a system to manage its affairs.
• A major oil company with diverse holdings, complex oil leases, and esoteric accounting practices needs a system that can coordinate its many enterprises.
• A large organization with multiple divisions needs an information system to support its operations.
The information needs of the various divisions are diverse, but standard within their respective industries.