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In constructing the network which one of the following statement is false? 

(a) Each activity is represented by one and only one arrow, (i.e) only one activity can connect any two nodes. 

(b) Two activities can be identified by the same head and tail events. 

(c) Nodes are numbered to identify an activity uniquely. Tail node (starting point) should be lower than the head node (end point) of an activity. 

(d) Arrows should not cross each other.

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(b) Two activities can be identified by the same head and tail events.

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