Concept:The Giant Metrewave Radio Telescope (GMRT) is an array of multiple dish antennas.
Explanation:GMRT consists of 30 fully steerable parabolic dishes, each 45 metres in diameter.
These antennas are spread over distances up to 25 kilometres near Pune, India.
They work together using interferometry to function as a single large telescope.
The parabolic shape focuses radio waves, which is essential for capturing signals.
GMRT operates at radio frequencies from 50 MHz to 1.5 GHz, making it a versatile observatory.
It is used to study astronomical phenomena such as pulsars, quasars, supernovae, and galaxies.
The array design enhances resolution and sensitivity compared to a single dish.
Thus, GMRT has multiple parabolic antennas, not a single antenna or circular ones.
Answer:Option B: multiple parabolic antennas.