Which one of the following statements is incorrect?
- The number of regions corresponds to the cyclomatic complexity
- Cyclomatic complexity for a flow graph $G$ is $V(G)=N-E+2$, where $E$ is the number of edges and $N$ is the number of nodes in flow graph
- Cyclomatic complexity for a flow graph $G$ is $V(G)=E-N+2$, where $E$ is the number of edges and $N$ is the number of nodes in flow graph
- Cyclomatic complexity for a flow graph $G$ is $V(G)=P+1$, where $P$ is the number of predicate nodes contained in the flow graph $G$