What is the meaning of 'Pishtaq', which is an important aspect of Mughal architecture?

Which of the following is one of the most striking structures decorated with Pietra Dura work in Agra, commissioned by Nur Jahan in the 17th century?

Consider the following statements regarding the architectural evolution of the arch during the Sur and Mughal periods: Statement 1: The arches in the Qila-i Kuhna Masjid feature a slight drop or flatness in the curve towards the crown. Statement 2: The flattened curve of these arches represents the fully developed form of the four-centred 'Tudor' arch pioneered by the Sur dynasty. Choose the correct option from below: