When was SAFTA signed?

2004

The correct answer is Option 3 - 2004

2004 January: SAFTA signed at the 12th SAARC Summit in Islamabad.

The South Asian Free Trade Area (SAFTA) is an agreement among the South Asian Association for Regional Cooperation (SAARC) member countries to promote regional trade and economic cooperation.
The SAFTA Agreement was signed in 2004 and came into effect on 1 January 2006. SAFTA aims at lowering trade tariffs.