A country has seven major cities - A, B, C, D, E, F and G. Three flights labeled X, Y and Z are available to connect the cities following the rules:

Flight X has its ends at A and C, and passes through B only.

Flight Y has its ends at B and C, and passes through D only.

Flight Z has its ends at E and G, and passes through F only.

Directly connected cities are those cities between which there is no other city to land any flight.

Which of the following city is directly connected to the most other cities?