Problem $2$: Consider the following control flow graph $($CFG$)$ and answer the following questions.

$1.$ Find all the EBBs in the $CFG$;

$2.$ Check if any of the following block sets $($and their associated edges$)$ may form a region

a$.\{B,C,D\}$

b$.\{B,C,D,E\}$

c$.\{C,D,E,F\}$

d$.\{B,C,D,E,F,G\}$

$3.$ Find the dominator set for each basic block;

$4.$ Build the dominance tree for the $CFG$;