As per the standards set by the Department of Telecom, Government of India, for all the new designs of mobile handsets, the permissible Specific Absorption Rate (SAR) limit is _______ averaged over 1 gram of human tissue with effect from 1st September 2012.
1. 1.8 W/kg
2. 2.1 W/kg
3. 2.2 W/kg
4. 1.6 W/kg