Functions that do not have a data type are called .
a.
zero
c.
void
b.
null
d.
empty

c. void

Explanation:

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A function that doesn't have a data type is considered to be a void function. This means that it will not return any data type value. Regardless of what is inputted, it completes the set of instructions or methods within the function and terminates the function. If a value is tried to be returned from a void function it will just show up as a compilation error.

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