Principles of Programming Languages

I have no idea about these three questions, please help me! Thank you!

Consider the C code below and the box-circle diagram to the right which illustrates the situation at point 1 . Assume stack memory allocation for nested scopes is used (which means that memory for variables in a scope is allocated on the stack and that it is deallocated when the scope is exited). 1. At point 1 , the location associated with z is m3 m8 m9 m12 At point 2 , there is an arrow from location m7.1 to location m3 m7.1 m8 m9 m12 At point 6 , there is an arrow from location m6 to location m4 m5 m6 m7 Undefined