中国大学MOOC: A strong scientific title is descriptive, brief, specific, and accurate. It also useskey words that readers will search for. The title with the √ before it is considered to be the better one. Decide whether the following choice is the correct one. 4. A. An Experimental Observation of a Pair of Spin-Polarized Fermi Arc Surface States on the Surface of the Dirac Semimetal Na3Bi at Its Native Chemical Potential√ B. Observation of Fermi Arc Surface States in a Topological Metal