Which one is the advantage of “E-recruiting”?

Which one is the advantage of “E-recruiting”?
A.Online application recruiting may inadvertently exclude disproportionate numbers of older applicants because fewer of them use the Internet.
B.It provides organizations with a highly cost effective and efficient means of attract qualified applicants on a global basis, reducing traditional job adverts cost.
C.The risk of cheating and faking has also been increaseD.D.Using e-recruiting at organizations may involve some legal risks.
正确答案：It provides organizations with a highly cost effective and efficient means of attract qualified applicants on a global basis, reducing traditional job adverts cost.