What is the answer of this multiple choice question?

When you apply a fork(), the parent and child
a) Share memory
b) Do not share memory
c) Share a small part of the memory
d) They can communicate via arrays

Given this piece of code int fd[2];pipe(fd); this means that
a) The parent can write in fd[1] and the child can also write in fd[1]
b) If the parent read from from fd[0] , the child also can read from fd[0]
c) If the parent wrote in fd[1] , the child can read from fd[0]
d) All of the above are correct and sounds logical