Advertising on TV, print, and radio typically requires a predetermined budget. What key differences enable some online a

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Advertising on TV, print, and radio typically requires a predetermined budget. What key differences enable some online advertising campaigns to invest with more flexibility without a predetermined budget in mind?

A. Budgets cannot be applied to online campaigns due to constant changes in traffic.
B. Online campaigns are highly measurable and can often automate a positive ROI. It can be strategic to capture all traffic without a predetermined budget as long as ROI is positive.
C. AdWords budgets can only be set once annually and require a fixed commitment.
D. Online campaigns generate clicks, whereas other channels generate exposure.