ADS301mXuất hiện trong 1 đề thi
If search engine algorithms are kept a mystery, how should an SEO professional best determine which factors influence rankings?
Các lựa chọn
ARelying solely on official statements from search engines.
BUsing observation, testing, and community-shared learning.
CBuying proprietary data from third-party link brokers.
DGuessing based on the visual appearance of results.