Detailed Solution:
The correct answer is “Both a and b are correct”.
Guntuphalli (Andhra Pradesh) is known for its rock-cut caves and Buddhist remains, including chaityagrihas and viharas.
The Eastern Deccan region of India, which includes areas such as Maharashtra and Andhra Pradesh, is well-known for its rock-cut architecture. Many chaityas and viharas in this region were carved out of rock, showcasing the rich Buddhist heritage of the area.