a) If the object inherits enumerable properties
b) The object does not have the properties present in the integer array indices
c) The delete keyword is never used
d) Object.defineProperty() is not used
Answer: a
Explanation: In computer programming, an enumerated type (also called enumeration or enum) is a data type consisting of a set of named values called elements, members or enumerators of the type. The enumerator names are usually identifiers that behave as constants in the language.
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