For the following electrochemical cell, determine the oxidizing agent, reducing agent, and whether the cell is a voltaic cell or electrolytic cell. 
 Fe(s) / Fe2 (aq) (1.0 M) // Ni2 (aq) / Ni(s).
 a. NiB.
 b. Ni2+ 
 c. Fe
 d. Fe2+ 
 e. voltaic
 f. electrolytic