What are two limitations to the data being returned by the Controller?

A developer wants to call an Apex Server-side Controller from a Lightning Aura Component .

What are two limitations to the data being returned by the Controller? Choose 2 answers
A . A Lists of Custom Apex Classes cannot be returned by Apex Controllers called by Lightning Aura Components.
B . Basic data types are supported, but defaults, such as maximum size for a number, are defined by the objects that they map to.
C . A custom Apex Class can be returned, but only the values of public instance properties and methods annotated with @AuraEnabled are serialized and returned.
D . Only Basic data types and sObjects are supported as return types for Apex Controllers called by Lightning Aura Components.

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Answer: B,C