Stan is a comic book artist. In a year's work Stan could write 50 comic books or help producing 2 movies (the number of movies is much lower, as he would need to travel and for the sets to be built before giving his input). The recent pandemic inspired him to write more episodes for his comic books and allowed him to give feedback on movies from th comfort of his home. As a result, in a year's work he is now able to write 55 comic books and help producing 7 movies. Which of the following effects has the pandemic NOT caused? Select one answer: O Stan's opportunity cost of helping to produce movies has decreased O Stan has become relatively more productive in helping to produce movies O Stan's opportunity cost of writing comic books has increased O Stan's Production Possibility Frontier (PPF) shifts up