Which of the following are the features for managed packages? Choose three

Answer options:

A.You can’t view or change the offering’s code or metadata.
B.The provider can automatically upgrade the offering.
C.The contents of the package don’t count against the app, tab, and object limits in your org.
D.You can customize code and metadata, if desired.

Correct Answer: A, B, and C 
Managed Packages doesn’t allow you to view or change the offering’s code or metadata in addition to this the provider can automatically upgrade the offering and the content of the package don’t count against the app, tab, and objects limits in the org. 
Option D is incorrect because you can’t view or change the code or metadata for a managed package. 
Reference:

https://help.salesforce.com/articleView?id=managing_packages.htm&type=5