Final answer:
A strong password should include uppercase letters, special characters, and numbers. Personal information like birthdates and pet's names should not be used as they are easily guessable.
Step-by-step explanation:
When creating a strong password, it is recommended to combine multiple character types to enhance security. The three elements that should be combined are:
- Uppercase letters
- Special characters
- Numbers (not listed in the provided options)
Avoid using personal information such as birthdates or pet's names as they can often be easily guessed or obtained by malicious individuals. Instead, focus on a mixture of letters (both uppercase and lowercase), numbers, and special characters to create a password that is difficult for others to crack.