Log Out of WhatsApp
WhatsApp for Android doesn't have the "log out" option.
After you've cleared the data of the WhatsApp, you'll be in the welcome screen of WhatsApp.
If you wish, you can get into your WhatsApp account after the verification process.
Log Out of WhatsApp Web
In the WhatsApp Web, click on the Overflow Menu (three vertical dots) at the top. Now, you can see "Log out" option. Hit it, and that's all.
Log Out of WhatsApp Web Remotely
You can remotely log out of WhatsApp Web, and here are the steps:
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How to Log Out of WhatsApp