What is the maximum user mailbox size for an Office 365 E3 license?

What is the maximum user mailbox size for an Office 365 E3 license?

• Unlimited
• 50 GB
• 1 TB
• 100 GB         

EXPLANATION

Simple question, something I learned recently as I was solving an issue with a user's mailbox.

User mailbox storage limit for an E3 license is 100 GB, it's archive limit is unlimited and its address list limit is 1000.

SOURCE

https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits