How dia Google develop a covert classitiea test on Bing's search resuits in vecember $\frac{?}{{?}_{010}}?$

Multiple Choice

They changed the results of random search terms within a Google search to see if the same results appeared on a Bing search for the same word probe.

They paid current Bing employees to give Google information on their search engine algorithm.

They had Google employees get hired at Bing to spy on their search engine process.

They hired twenty engineers to work together as a team to investigate Bing's algorithm.