You have a Microsoft Exchange Online tenant that contains a user named User$1.$

User$1$ reports receiving a non$-$delivery report $($NDR$)$ in their inbox that contains the error code $5\mathrm{.}2\mathrm{.}2$ with the text "Submission quota exceeded".

What is a possible cause of the NDR$?$

Select only one answer.

The account has been compromised and is being used to send spam.

User$1$ has attempted to send a message that is over the Sent messages maximum size restriction.

User$1$ has attempted to send a message to a recipient that has reached their Sent messages maximum size restriction limit$.$

User$1$ has run out of storage space in their Exchange Online mailbox.