Answer the given question with a proper explanation and step-by-step solution. Which statement will add a new key, "Unit 5", and its associated value, "Josip", to the Python dictionary called residents?   residents = {"Unit 1": "Marley", "Unit 2": "Bruce", "Unit 3": "Ramesh", "Unit 4": "Ivy"}     a. residents = {"Unit 5": "Josip"}   b. residents["Unit 5"] = "Josip"   c. residents.append("Unit 5", "Josip")   d. residents["Josip"] = "Unit 5"

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