I really need to know the following information, an I cannot get a clear answer

Question

I really need to know the following information, an I cannot get a clear answer from my textbook or the internet.
PLEASE HELP!!!

Which is true about Java interface?
a) a collection of constants and abstract methods
b) a collection of variables and abstract methods
c) a collection of variables and methods
d) a collection of objects and methods

Which is NOT true about Java interfaces?
a) An interface could provide specific guidelines to class designers
b) An interface could partially support multiple instances
c) An interface could be used to define a polymorphic variable
d) An interface could be used to create an abstract object

Explanation / Answer

1) a) a collection of constants and abstract methods 2) d) An interface could be used to create an abstract object

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