Consider the following LP table which minimizes $z$

Please write the conditions for unknowns $a_1,a_2,a,b$ and $c$ which makes the following

sentences true;

a$)$ LP is not a basic feasible solution$(5$ pts$)$

b$)$ LP is an optimal solution and there are alternative optimal solutions$(10$ pts$)$

c$)$ LP is unbounded. $(10$ pts$)$