Which one declares an optional float variable? let optionalFloat? var optionalFl

Question

Which one declares an optional float variable?

       let optionalFloat?
       var optionalFloat: Float = 0.0  
       let optionalFloat: Int?
       var optionalFloat: Float?
       var Float?: Float?

       var allCountries: [String:MyPassWord] = [1];
       var allCountries: [String] = [:]; allCountries.insert("MyPassWord");
       var allCountries: [String] = [ ]; allCountries.append("MyPassWord");
       var allCountries: [String] = [ ]; allCountries.add("MyPassWord");
       let allCountries: [String] = [ : ]; allCountries.add("MyPassWord");

       @IBAction, slider UISlider
       @IBAction, Slider
       @IBOutler, UISlider
       @IBOutlet, Slider UIslider
       @IBAction, UISlider

Which one declares an optional float variable?

Explanation / Answer

Ans:

1) var optionalFloat: Float?

2)   var allCountries: [String] = [ ]; allCountries.append("MyPassWord");

3) @IBAction, UISlider

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