The correct answer is B.
OBJ-3.1: In the above REGEX, the \b parameter identifies that we are looking for whole words. The strategic use of the + operator indicates the three places where the word is broken into parts. The first part ([A-Za-z0-9_%+-]” is composed of upper or lower case alphanumeric symbols “_%+-.” After the first part of the word and the at sign (@) is specified, follows by another word ([A-Za-z0-9.-]), a period (\.), and another purely alphabetic (non-numeric) string that is 2-6 characters in length. This finds a standard email format of email@example.com (but could be @something.co, @something.org, @something.money, or other options as long as the top-level domain is between 2 and 6 characters). The option of www.diontraining.com is wrong because it does not have an @ sign in the string. The option of firstname.lastname@example.org is wrong because you cannot use a period before the @ symbol, only letters, numbers, and some specified symbols ( _ % + – ). The option of email@example.com is wrong because the last word (training) is longer than 6 characters in length. As a cybersecurity analyst, you must get comfortable creating regular expressions and understanding what type of output they generate.