Which of the following statements are true according to Mercator: A Scalable, Extensible Web Crawler by Allan Heydon and Marc Najork.

Group of answer choices

$($A$)$ Mercator provides URL seen test and content seen test to detect duplicate URLs and duplicate contents respectively.

$($B$)$ Mercator uses multi$-$threads and asynchronous I$/$O for parallel crawling.

$($C$)$ Mercator is configured to crawl the Web as a random walker.

$($D$)$ Mercator reports slightly faster crawling rate than google reported rate of $33\mathrm{.}5$ docs per second.

$($E$)$ Mercator can prevent crawler traps.