On a cost-per-thousand (cpm) basis, the cost of web ads for the most
a) is much less expensive.
b) does not cost anything, because there is no charge to subscribe
c) compares favorably with ads placed in traditional media
d) is a great deal more expensive than traditional media

c)compares favorably with ads placed in traditional media.

Explanation:

CPM(cost-per-thousand) is basically defined as the one web page that has cost 1000 advertisements in the marketing world. Web ads or advertisements are the online marketing strategy that is also known as online advertising. So, according to the CPM,web ads have a main focus on the comparison with the traditional media as they advertise through the traditional ways such as radio , printing etc.So, there is a sort of competition in both the methods for advertising.

d. use a mixture of external and internal links

explanation:

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