The correct option is Both of the above methods.

The Reset the user password in the tenant identity management console approach addresses identity level problems such as compromised credentials or sign in blocks so resetting the password can restore authentication and allow the user to send mail. The Use Exchange Online PowerShell to clear the block approach addresses mailbox and mail flow controls so PowerShell enables an administrator to remove mailbox specific send restrictions or clear transport level blocks without changing the user password. Depending on the root cause an admin may need one or both of these actions which is why the combined option is correct.

Reset the user password in the tenant identity management console is incorrect when chosen alone because it only fixes identity related issues and will not remove Exchange level send restrictions or transport blocks. If the block was applied by Exchange you must also clear it at the messaging level.

Use Exchange Online PowerShell to clear the block is incorrect when chosen alone because Exchange level fixes do not resolve identity problems such as a compromised password or a disabled account. In those cases you must also restore or reset the user account in the tenant identity management console.

Remove the account from the "Restricted accounts" section of the organization security portal is incorrect because that action does not describe the standard, supported way to clear send blocks in Exchange or Azure AD. That wording may refer to older or different security features and is not the current method used to restore sending rights on the modern admin consoles.

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