One day, your mobile phone received a short message telling you that your online banking needs to be upgraded. What would you do?

1. Verify the SMS source: I will carefully verify whether the SMS source is the online banking I really use.

2. Don't click on the link: I won't easily click on the link in the short message or provide the URL, because these links or URLs are probably phishing websites, which may have security risks.

3. Upgrade through official channels: If I confirm that I need to upgrade online banking, I will download the online banking upgrade program through official channels or go to the bank in official website to upgrade.

4. Precautions: I will pay attention to the security issues in the use of online banking, such as not using online banking in public places, not easily revealing the password of online banking accounts, frequently changing passwords, and keeping passwords complicated.