PLEASE ANSWER ALL PARTS! Questions in Swift

5. Rewrite the following code to use a guard statement instead of if: func twice(x:Int?) -> Int? { if let x1 = x { return 2*x1 } else { return nil } 6. The scope of a constant or variable is the section of code where the symbol is defined. The scope of the constant declared in an if-let statement (e.g. x1 in the code above) is within the braces of the if statement. What is the scope of the constant defined in a guard-let statement? Explain why