a) After a fork, the parent and child both have copies of all global variables. I.e., if there is a global x before the fork, then after the fork both the parent and child can read and write x. True False b) After a fork, changes to a global variable in the parent will be visible to the child. (1.e., if x is O before the fork, and after the fork the parent sets x = 1, then the child will see the value of x as 1.) True False c) Coalescing refers to moving allocated blocks to create larger regions of free space. O True False d) Segregated free lists divide blocks into different size classes, but some classes may contain more than one block size. True O False