Which of the following is recognized as a strong password practice?

Choosing a mix of letters, numbers, and symbols is recognized as a strong password practice because it significantly enhances the complexity and unpredictability of the password. A password that incorporates various character types is much harder to guess or crack using brute-force methods compared to a simple sequence of letters or numbers. This layered approach makes it challenging for attackers who employ algorithms that can rapidly guess common words or easily accessible information.

Incorporating a variety of characters ensures that the password has a higher entropy, which means that there are far more possible combinations. This makes it less susceptible to attacks, such as dictionary attacks, where potential passwords are generated based on common phrases or personal information. Overall, using a mix of different types of characters helps create stronger and more secure passwords, aligning with best practices for safeguarding sensitive information.