Identify the correct statements with reference to insolation.

A. In summer season length of the day will be longer at Jammu as compared to Chennai.

B. In a year, the sun's rays are vertical twice at Varanasi.

C. The southern slopes of the Himalayas receive more insolation as compared to the northern slopes.

D. The share of visible wavelength is more than the share of ultraviolet wavelengths in total insolation.

Choose the correct answer from the options given below: