run$($self$)$: This method takes in no parameters $($aside from self$),$ and $$runs$$ the Decision, allowing the user to choose amongst the available options.$$ In particular, it should do the following:

Verify that self.options is not an empty list.$$ If self.options is empty, then just immediately return the string $\text{'}$No options available'.

Print out the prompt for this Decision object, with a newline before and after to make it easily distinguishable from the options.

Print out the available options.$$ Each option should be preceded by the index of that option within the list $($so if there were $9$ options then each option would be preceded by a number between $0$ and $8).$ See the example below.

Ask the user to input a number between $0$ and the highest valid index.$$ You may assume that the user will input a valid number.

Get the element at that index from the self.results list.$$

If the element at that index is a string, return the string.

If the element is a Decision object, call the $.$run$()$ method on that Decision object and return the resulting string.