(a) Geodetic survey
(b) Aerial survey
(c) Plane survey
(d) Geological survey
Ans (c) Plane surveying

Explanation :-
Surface of earth is considered as a plane and the spherical shape (earth curvature) is neglected.
• All survey line and triangles are considered as plane and straight.
• Small area and small distances are covered.
• Degree of accuracy is comparatively low.
• The area to be surveyed less than 250 km2
.