Final answer:
SaaS billing differs from that of a widget factory because it incorporates a subscription-based model, on-demand usage billing, and requires internet access for service delivery, encompassing all of the above options.
Step-by-step explanation:
The question you've asked pertains to the differences in billing methods between SaaS (Software as a Service) and traditional physical goods businesses like a widget factory. The correct answer is d) All of the above.
SaaS billing is distinct because it often operates on a subscription-based model, where clients pay recurrently for access to software. This model contrasts with a widget factory, where billing typically occurs per item purchased. Additionally, some SaaS solutions offer on-demand usage billing, charging clients based on the intensity or volume of service used. SaaS products are accessed via the internet, which dictates an entirely different delivery and billing logistics compared to physical goods. Traditional manufacturing billing might entail one-time transactions that are more direct and tangible.