When Working with a Security Consultant That Your Company Has

Multiple Choice

When working with a security consultant that your company has hired, you notice that he is running software on one of the machines. He explains that the program is running a brute force attack that is using every word in the English language to see if the Administrator password can be cracked.  
What type of attack is he attempting?

A) Rainbow table
B) Dictionary
C) Zero-day
D) Phishing