PLEASE ANSWER ALL PARTS! Questions in Swift

1. What is the purpose of the guard statement? a. to perform evaluations that are impossible to perform with an if statement. b. to simplify control flow and indentation c. to delay having to deal with invalid parameters d. all of the above 2. When must you use a guard statement? a. when if-let will not unwrap an optional because you don't know the type b. whenever the conditional is too complex to evaluate with an if statement c. whenever you encounter a value that might be nil d. never 3. When does the guard statement execute its body (the code in brackets)? a. when the conditional evaluates to false b. after the optional is unwrapped c. once the conditional becomes true d. if the unwrapped optional contains nil e. none of these 4. What will be returned at the end of the function? calculate Result(a: 4, b: 8, c: nil) func calculateResult(a: Int?, b: Int?, c: Int?) -> Int { guard let aValue = a else { return 0 } guard let bValue = b else { return aValue } guard let cValue = c else { return bValue } return aValue + bValue + cValue