Which of the following best describes e-commerce?

E-commerce (electronic commerce) refers to the conduct of business transactions using electronic and digital means, particularly over the internet — including the buying, selling, and exchange of goods, services, and information through digital networks and payment systems, as distinct from traditional face-to-face or paper-based commerce.

Applying this definition here, the description that specifically names the medium of the transaction as electronic is the one that identifies e-commerce, since the electronic medium is exactly what differentiates e-commerce from commerce in general.

• "Doing business" describes commercial activity in general terms without naming any medium — electronic or otherwise — through which that activity occurs, so it does not capture what distinguishes e-commerce from commerce broadly.

• "Sale of goods" names one specific commercial activity — selling merchandise — but omits both the electronic medium and the wider scope of business activities (services, information exchange, and so on) that e-commerce covers.

• The composite choice combining each of the individually offered descriptions would only be accurate if every one of those descriptions independently satisfied the definition of e-commerce; since two of them omit the electronic element, that composite description cannot be the accurate one either.

Cross-checking against widely used definitions — for instance, the WTO and OECD both define e-commerce as commercial transactions conducted through electronic or computer-network means — the description naming the electronic medium as the defining feature is the one that matches, confirming "Doing business electronically" as the accurate description of e-commerce.