Q27. What is the equation of a circle with its center at the origin (0, 0) and a radius of 1 (unity)?Mathematics — Conic Sections — Question 27 of 272A. x2 + y = 0B. x2 - y - 1 = 0C. x + y = 1D. x2 + y2 = 1Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →