Which statement(s) are incorrect about Fractional Factorial Designs?

Which statement(s) are incorrect about Fractional Factorial Designs?
A . A Half Fractional Design for 5 factors has the same number of experimental runs as a Full Factorial Design for 4 factors assuming no repeats or replicates or Center Points
B. Quarter Fractional experiments can exist for those with 4 factors
C. Resolution V design is desired while controlling costs of experimentation
D. Half Fractional experiments do not exist for those designs with only 2 factors

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Answer: C