Consider the following statements about Chlorofluorocarbons (CFCs) : 1. CFCs remain inert in the troposphere but slowly diffuse into the stratosphere. 2. CFCs in the upper atmosphere are subjected to UV radiations, generating free radical chlorine that immediately reacts with O3 to form a radical called chlorine monoxide (ClO). 3. Each ClO can initiate a series of chemical reactions, leading to the destruction of the ozone layer. How many of the statements given above is/are correct ?