Which statements about the SUSE Software Subscription model are true? $($Select all that apply$)$A$.)$ Product updates are only available to customers with a current SLE subscription.B$.)$ Product updates are only available to customers having an account with the SUSE Customer Center and a SLE Product Key.C$.)$ You must use YUM Repositories to mirror updates from the SUSE Customer Center.D$.)$ Subscriptions are based on the number of virtual servers.E$.)$ Subscriptions are based on the number of physical servers.