Which of the following statements about the nervous system of cockroach are correct? (1) It consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side (2) There are three ganglia in the thorax and six in the abdomen (3) Sense organs are antennae, eyes, maxillary palps, labial palps and anal cerci (4) Each compound eye consists of several thousand hexagonal ommatidia