Which password is considered the strongest based on complexity?

The password "jOhn$m1T" is regarded as the strongest due to several factors that contribute to its overall complexity. First, it includes a mix of upper and lower case letters, which enhances its strength by adding variability. The presence of special characters, such as the dollar sign, further complicates the password, making it less predictable and harder to guess. Additionally, it contains numbers, which add another layer of complexity.

Overall, strong passwords typically incorporate a combination of different character types (uppercase, lowercase, numbers, and symbols) and avoid common words or patterns. The other choices do not meet these complexity criteria to the same extent. For instance, "P@ssw0rd" is a well-known variation of a common password and still resembles a recognizable word, making it weaker. "Johnny" and "Password" are straightforward words that are among the first attempts in brute-force attacks, making them very insecure. Therefore, the selection of "jOhn$m1T" reflects its superior strength, safeguarding it against various forms of cyberattacks.