Which of the following represents an example of a simple, weak password?

A simple, weak password is typically one that is easy to guess or crack due to its simplicity or use of common words. The answer given, "Johnny," exemplifies this because it is a common name that many people might use. Names, especially those that are very recognizable or popular, do not include any complexity (such as a mix of upper and lower case letters, numbers, or special characters) that would enhance their security.

In contrast, the other options contain a variety of characters or special elements. For example, "jOhn$m1T" includes both upper and lower case letters, a number, and a special character, making it significantly stronger. "P@ssw0rd" also mixes letters, a substitution with a number, and a special character, even though it is famously weak due to its common use. "Secure#123" includes a combination of characters as well. Overall, the lack of complexity and predictability in "Johnny" makes it an exemplary case of a weak password.