Cyclobutadiene has been found to form a stable complex with an iron tricarbonyl fragment. The four-carbon ring in this complex has been found to have aromatic properties. Answer the following two questions about this complex: 1) Using a combination of L, X, and Z, what is the covalent bond classification of the cyclobutadiene ligand in this complex? 2) What is the formal number of pi electrons in the cyclobutadiene ring in the complex?