अमरोहा (पूर्व नाम ज्योतिबा फुले नगर) जिले का प्रशासनिक मुख्यालय कहाँ स्थित है?

In the administrative geography of Uttar Pradesh, which district has its headquarters located in the town of 'Khalilabad'?

Which of the following districts of Uttar Pradesh shares its borders with the maximum number of other Indian states, specifically bordering four different states?