Q. Linea nigra is

(a) brownish black pigment red area in the middle stretching from the umbilicus to symphysis pubis
(b) brownish black pigment red area in the midline stretching from the xiphisternum to the symphysis pubis
(c) Brownish black pigment red area in the midline stretching from the umbilicus to thighs
(d) slightly depressed linear marks with varying length found in abdominal walls