please even if you can only answer one question, explain. I am confused on what offset means.

Problem 1. Answer the questions about the declaration in each part. Remember the alignment requirements! ( 2 points possible total per lettered part) What is the offset of number from the beginning of foo? What is the offset of key? b. struct \{ long x; int y; long *ptr; \} bar; What is the offset of y from the beginning of bar? What will sizeof (bar) be? c. struct \{ short a; short bptr; short x; short *xptr; \} bazz; What is the offset of bptr from the start of bazz? How about the offset of xptr? d. struct \{ char *content; int length; int capacity; \} gribble; What is the offset of content from the beginning of gribble? Of capacity