Explanation:

Ultraviolet (UV) is a type of light or radiation naturally emitted by the Sun. 

• It covers a wavelength range of 100-400 nm.
• The human visible light ranges from 380–700 nm.

Types of UV bands and their effect on humans: 

• UV-C (100-280 nm), 
• UV-C radiation from man-made sources has been known to cause skin burns and eye injuries.
• UV-B (280-315 nm) and 
• UV-B rays can only reach the outer layer of our skin or epidermis and can cause sunburns and are also associated with skin cancer.
• UV-A (315-400 nm).
• UV-A rays can penetrate the middle layer of your skin or the dermis and can cause ageing of skin cells and indirect damage to cells’ DNA. 
• UV-A and UV-B rays from the Sun are transmitted through our atmosphere and all UV-C is filtered by the ozone layer. 

Hence only statement 1st is correct.