Question: Consider the multiplicative group Z 1 5 . The elements in this group are of order 1 , 2 or 4 . Why is this

Consider the multiplicative group Z15. The elements in this group are of order 1,2 or 4.
Why is this not a good group to use in cryptography?
Group of answer choices
it is not cyclic
there does not exist an element in this group that is a generator
the modulus is not prime
all of the reasons hold except for the answer that stages this is a good group to use in cryptography
this is a good group to use in cryptography

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