How can you know if marketing communication objectives are being met?

How can you know if marketing communication objectives are being​ met?

A.If the marketing communications has been improved upon and customers have no​ complaints, then the marketing objectives are being met.

B.If projected sales are met or​ exceeded, the marketing communication objectives are being met.

C.Take a benchmark​ measurement, run a​ campaign, and then measure again.

D.Run a marketing​ campaign, measure the​ results, and then take a benchmark measurement.

E.Measure the results of the marketing​ campaign, take a benchmark​ measurement, and then run a marketing campaign.