In a hypothetical scenario, an element from the 7th period, Z, forms a stable compound with chlorine, ZCl_x. This compound displays unusual electronic properties, including high electrical conductivity in the solid state. Given Z's position in the periodic table and the characteristics of the compound, what is the most probable value of x in ZCl_x, and what type of bonding and electronic structure does ZCl_x most likely possess? Options: a) x = 3, with ionic bonding predominating and Z having a pseudo-noble gas configuration. b) x = 5, with a combination of covalent and metallic bonding, involving participation of f and d orbitals of Z. c) x = 7, with covalent bonding and delocalized -electron systems across a polymeric structure. d) x = 4, with ZCl_x forming a network covalent structure, similar to silicon carbide, involving sp3 hybridization.