Four $16 - \mu \mathrm { F }$ Capacitors Are Connected in Combination

Short Answer

Four $16 - \mu \mathrm { F }$ capacitors are connected in combination. What is the equivalent capacitance of this combination if they are connected
(a) in series?
(b) in parallel?
(c) such that two of them are in parallel with each other and that combination is in series with the remaining two capacitors?