Which of the following statements about Indo-Islamic architecture during the Tughlaq period is incorrect?
AThe Tughlaqs constructed notable structures like Tughlaqabad and the tomb of Ghiyasuddin Tughlaq.
BIndo-Islamic architecture blended Hindu and Muslim architectural elements, such as brackets and domes.
CThe Tughlaqs exclusively used red sandstone for their architectural projects.
DRegional styles from places like Bengal and Gujarat contributed to the evolution of Indo-Islamic architecture.