PS2. (10 points) Assume the following Javaseript program: var x=4; var y=7; Function Sub1() \{ Document. write(" x="+x+n); Sub3(); Function Sub2() \{ var y; y=5; Sub1 ); Function Sub3() \{ Document. write(" y=n+y+n); 3 main Sub2(); What are the values of x in Sub1 () and y in Sub3() displayed when those functions are executed from main under dynamicscoping rules? PS3. (10 points) Perform the pairwise disjointness test on the grammar C, and SHOW your steps ( 5 points off if not showing), check gass, or fail. acAAccbBa