Explanation:

Only statement 3rd is correct.

• These temples have complex architectural features, such as star-shaped plans and stepped roofs. 

• Statements 1 and 2 are incorrect. The Sacred Ensembles of the Hoysalas are a group of three Hindu temple complexes in the Indian state of Karnataka that were built by the Hoysala dynasty between the 11th and 13th centuries.  The three temples are: Chennakeshava Temple at Belur, Hoysaleswara Temple at Halebidu, and Keshava Temple at Somnathapura. Hoysaleswara temple, also referred to as the Halebidu temple, is a 12th-century Hindu temple dedicated to Shiva. It is located on the banks of Dwarasamudra tank. 

Hence option 1st is correct.