The area (in sq. units) of the region described by $A=\{(x, y)|y ≥ x2−5x+4, x+y ≥ 1, y ≤ 0\}$ is :

Question

$\begin{array}{1 1} (1) \large\frac{7}{2} \\ (2) \large\frac{19 }{6} \\ (3) \large\frac{13}{6} \\ (4) \large\frac{17}{6} \end{array}$