As a person working in internet banking environment, why you should be aware of the “Dictionary attack”?

As a person working in internet banking environment, why you should be aware of the “Dictionary attack”?
[A]It is used to inject worms or viruses in the system
[B]It is used to determine a password
[C]It is used to access customer’s account by determining other details
[D]It is used for stealing info from the Credit Card
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