e-commerce does not include

(a) A business's interaction with its suppliers.

(b) A business's interactions with its customers.

(c) Interactions among the various departments within the business

(d) Interactions among the geographically dispersed units of the business.

e-commerce does not include interactions among the various departments within a business. This is because inter-department interactions that take place among the departments of a business enterprise are not related to trade. On the other hand, interactions between a business and its suppliers and customers, and among its geographically dispersed business units, form part of e-commerce.

Hence, the correct answer is option (c).