11. (5 pts.) What is the primary block of storage managed by Subversion (i.e., what unit of storage do you get when you check out something from a Subversion repository)? 12. (5 pts.) Present one example of a situation in which it is desirable (or necessary) to use global variables 13. (10 pts.) Here are two lines from a makefile: main.o: main.c helper.h gcc main.c What action(s), if any, will be taken by the make program upon reading the above 2 lines in a makefile