The correct option is 2 and 3 only.
Explanation
The Taj Mahal is considered the zenith of Mughal architecture, combining elements from Islamic, Persian, Ottoman Turkish, and Indian architectural styles. It stands as a monumental mausoleum on the southern bank of the Yamuna River in Agra.
Statement 1 is Incorrect: The Taj Mahal was commissioned by the Mughal Emperor Shah Jahan in 1632 to house the tomb of his favourite wife, Mumtaz Mahal. It was not built by Jahangir for Nur Jahan.
Statement 2 is Correct: The construction of the complex began around 1632. While the main mausoleum was completed in 1643, the surrounding buildings and gardens were finished around 1653. Therefore, the entire project took nearly 22 years to complete.
Statement 3 is Correct: The project employed a massive workforce estimated at 20,000 artisans and labourers. These workers were recruited from across northern India, as well as from Central Asia and Iran, and included stonecutters, inlayers, carvers, painters, calligraphers, and dome-builders.
Key Takeaway: The Taj Mahal was built by Shah Jahan in memory of Mumtaz Mahal, utilizing a workforce of approximately 20,000 artisans over a period of roughly two decades.