What makes GREP so powerful when used in a Forensic toolkit?

a$.$

Using a customized expression, it can parse through an entire drive searching for specific words, patterns or numbers

b$.$

It can reveal encrypted password just by searching for the username

c$.$

It generates additional search terms from one word

d$.$

It isn$$t a powerful utility$$all forensic toolkits have better search capabilities built$-$in and therefore do not use GREP