Can someone help me with my LUA homework?

Given function c (enclosed in function f with environment e), a reference to an instance of c (as z) (created from a call tof) has its environment set to k: local function f() local function c() end return c end setfenv(f, e) local z = f() setfenv(z, k) # Which of the following is always true:

a. z can still access all the locals of f that it initially had access to

b. z can still access all the globals of f that it initially had access to

c. All further new closures of c will have environment k

d. None of the above