________ terms are used to describe supercritical and ultra-supercritical coal generation by the coal industry.
(a)High- efficiency and low -emissions
(b)Low-efficiency and high- emissions
(c) High-efficiency and high- emissions
(d)Low-efficiency and low-emissions
(a)High- efficiency and low -emissions
(b)Low-efficiency and high- emissions
(c) High-efficiency and high- emissions
(d)Low-efficiency and low-emissions