Question 10 Select the following true statements regarding the concept of "Backtracking search". O lt chooses values for one variable at a time and backtracks when a variable has one more legal value left to assign. It incrementally builds candidates to the solutions, and abandons each partial candidate c, as soon as it determines that c cannot possibly be completed to an invalid solution. It incrementally builds candidates to the solutions, and abandons each partial candidate c, as soon as it determines that c cannot possibly be completed to a valid solution. It chooses values for one variable at a time and backtracks when a variable has no legal values left to assign. Question 11 How many integer points (x, y), where x and y are both integers, are in the feasible area x + y