Question: Which type (or types) of crystalline solid is characterized by each of the following: (a) High mobility of electrons through out the solid; (b) Softness,

Which type (or types) of crystalline solid is characterized by each of the following:
(a) High mobility of electrons through out the solid;
(b) Softness, relatively low melting point;
(c) High melting point and poor electrical conductivity;
(d) Network of covalent bonds?

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