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What would you use to assign the variable lastindex to the value of the last index of th string userName? lastindex = userName.length (0+2; lastindex = userName.length 0+1; lastindex = userName.length 0 - 1 : lastlndex = userName.length() : Question 19 (4 points) Saved For what values of x does the default case exccute in the code below? x is declared as an integer. avitch (x) f case 1: case 2: break: case 3: breaki case 4: case 5: break: dofaule: ... // When does this execute? Only for all values greater than 5 Only for values that are not 1, 2, 3,4, or 5 For any value Only for value 5 Only for values that are not 1, 3, or 5