In a murder case, police rounded up four suspects and one of those is surely a killer. These four suspects made the following statements:Suspect A said, “I am not the killer”.Suspect B said, “I am the killer”.Suspect C said, “A is the killer”.Suspect D said, “C is lying”.If out of the given four statements, only one statement is correct, then identify who is the real killer?

• A. C
• B. A
• C. D
• D. B