Top hiring sectors in Islamabad

What are the top hiring sectors?
In Islamabad: Development Sector, Private Education Sector, Mobile Telecom, Oil and Gas Exploration, Mining Companies, Foreign Missions.

And according to you, what are the most promising job sectors, which will keep creating jobs in Islamabad?
1. Development Sector (UN, USAID, UKAID, CIDA etc)
2. Private Education Sector (Cambridge System Schools, Universities)
3. Mobile Telecom