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Internet Denial Of Service attacks, which are feared by the administrators of many websites and web hosting companies, often bring or incapacitate systems, which provide vital computerized services.
This answer choice is grammatically incorrect.[[snippet]]
In addition, this answer choice is stylistically flawed. Since the words which are can be omitted without changing the meaning of the sentence, they are redundant.
This answer choice corrects both original mistakes (Split Construction and redundancy).
However, it also changes the meaning of the original sentence by changing the first words from which are feared by the to fearful, thus making it sound as if the attacks are the fearful administrators of websites.
This answer choice corrects the original stylistic flaw of redundancy caused by the words which are, but repeats the original Split Construction mistake.[[snippet]]
This answer choice corrects the one of the original Split Construction mistake, but repeats the original stylistic flaw since the words which are can be omitted without changing the meaning of the sentence, they are redundant.
There is another answer choice, which corrects the stylistic flaw. Look for it!
This answer choice corrects both original mistakes:
(a) Split Construction, by adding the required preposition down after the verb bring; and
(b) redundancy, by omitting the words which are.