An administrator has received complaints from end-users not receiving consistent email notifications on their iOS devices. Email is configured on the end-users devices using only the VMware Boxer email client. Boxer is only configured from Workspace ONE to use Office 365.

An administrator has received complaints from end-users not receiving consistent email notifications on their iOS devices. Email is configured on the end-users devices using only the VMware Boxer email client. Boxer is only configured from Workspace ONE to use Office 365.
What can the administrator do to resolve the inconsistent email notifications?
A. Configure VMware Email Notification Service v2 to provide consistent notification experience.
B. Configure VPN tunnel with a Boxer configuration, so that it is able to connect to the internal network.
C. Configure Secure Email Gateway v2 to provide a better notification experience.
D. Configure Mobile SSO for VMware Boxer to prevent users from entering credentials.