4. Two binary trees are similar if they are both empty or both nonempty and have similar left and right subtree. Write a method to decide whether two binary tree are similar. What is the running time of your method?

Write multiple if statements: if caryear is before 1968, print "probably has few safety features." (without quotes). if after 1971, print "probably has seat belts.". if after 1991, print "probably has anti-lock brakes.". if after 2002, print "probably has airbags.". end each phrase with period and newline. ex: caryear = 1995 prints: