Question: In order to implement Comparable in a class, what method ( s ) must be defined in that class? a . equals b . compares

In order to implement Comparable in a class, what method(s) must be defined in that class?
a.
equals
b.
compares
c.
both lessThan and greaterThan
d.
compareTo
e.
both compares and equals
ANS:

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