A seems like the obvious choice to me. SEO and PPC are the two complementary components that make up search engine marketing. I'm feeling good about selecting that option.
I'm leaning towards A as well, but I want to double-check the definitions of CPA and CTR just to make sure I'm not missing something. Better to be sure on an exam question like this.
Hmm, I'm a bit confused on this one. I know SEO and PPC are related to SEM, but I'm not sure if they're the only two components. I'll have to think this through carefully.
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