तुगलक वंश के तहत वास्तुकला में विशिष्ट विशेषताएं विकसित हुईं। तुगलक वास्तुकला के संबंध में निम्नलिखित में से कौन-सा कथन गलत है?

Who constructed Sultangarhi in Delhi, regarded as the first Islamic mausoleum built in India?

Consider the following statements regarding the Tomb of Iltutmish (c. 1235): 1. It is the first tomb of a ruling Sultan built in India, attached to the Quwwat-ul-Islam Mosque complex. 2. Its chamber is square in plan with the earliest squinch arches in Indian architecture, though corbelled rather than true/radiating — true squinch arches appear only later at the Alai Darwaza (1311). 3. The interior walls are profusely decorated with Arabic inscriptions from the Quran and geometric/arabesque ornament executed by indigenous craftsmen. 4. It was originally covered by a true dome that has survived intact. Which of the above statements are correct?