A Company Needs to Rebalance a Product Layout for Producing

A company needs to rebalance a product layout for producing new plastic license plates. They plan to use the assembly line six hours in order to meet projected demand of 2,160 license plates each day. The following table describes the tasks involved in the production of this product: $$\begin{array} { l l l } \text { Task } & \text { Time (secs) } & \text { Immediate Predecessor } \\\hline \mathrm { a } & 3 & \text { none } \\\mathrm { b } & 4 & \text { none } \\\mathrm { c } & 5 & \mathrm { a } , \mathrm { b } \\\mathrm { d } & 7 & \text { none } \\\mathrm { e } & 9 & \mathrm { c } , \mathrm { d }\end{array}$$ Without regard to projected demand, what is the minimum possible cycle time for this assembly line?

A) 0 seconds
B) 3 seconds
C) 9 seconds
D) 10 seconds
E) 28 seconds