My choice would be option 2.
1: Multiple people with the same password is technically not a problem, as long as they don't know it of eachother.
2: Every company has password complexity rules, such as minimum length requirements and the use of special characters, so it makes sense that your choice does not meet those requirements.
3: Doesn't make sense. Passwords are generally case sensitive so it is up to you to get the casing right.
4: Passwords are confidential, so validity should be checked by an algorithm, not a person. No other human with knowledge about your pets should be viewing your password.