Which of the following statements is correct? Select one: A. The covalent index X2mr is the ability of the metal to donate electrons to an electron acceptor. B. The toxicity of metals increases in the order Borderline < Type A < Type B metals C. The covalent index X2mr cannot be used to differentiate between type A, type B and borderline metal D. The values of ionic index are smallest for type A metals and largest for type B metals. E. The values of covalent index are smallest for type A metal and largest for type B metals.

Which of the following statements is correct? Select one: A. The covalent index X2mr is the ability of the metal to donate electrons to an electron acceptor. B. The toxicity of metals increases in the order Borderline < Type A < Type B metals C. The covalent index X2mr cannot be used to differentiate between type A, type B and borderline metal D. The values of ionic index are smallest for type A metals and largest for type B metals. E. The values of covalent index are smallest for type A metal and largest for type B metals.