7 The following are main requirements for a typhoon to form and develop, EXCEPT

a. Optimal location for typhoon development, which is 500 km from the equator
for the Coriolis effect to cause the powerful wind spin.

b. High humidity

c. An ocean with a temperature of 26'c spanning from the surface up to a depth
of at least 50 meters or more

d. An abundance of cold water​