A movie theatre sells 3 different sizes of popcorn: small, medium, and large. An order of popcorn comes with 4 different topping choices: butter, cheese, caramel, or salt. 1a. How many unique ways can yoI order a bag of popcorn?(You can only select one topping.) 1b. What is the probability that a randomly selected popcorn is large with either butter or salt?