What would you use to assign the variable lastIndex to the value of the last index of th string userName? lastlndex = userName.length ()+2 last Index = userName.length ()+1 last Index = userName.length() 1 lastIndex = userName.length() Question 19 (4 points) For what values of x does the default case execute in the code below? x is declared as an integer. switch (x){ case 1: case 2 : break; case 3: .. break: case 4: case 5: break: default: ... // When does this execute