Correct Answer:
Box 1: No -
An Azure AD tenant can have multiple subscriptions but an Azure subscription can only be associated with one Azure AD tenant.
Box 2: Yes -
Box 3: No -
If your subscription expires, you lose access to all the other resources associated with the subscription. However, the Azure AD directory remains in Azure. You can associate and manage the directory using a different Azure subscription.
References:
有关 AD 的订阅问题涉及到用户和订阅的关联情况。
这个问题考得比较多，需要仔细做几次。