How did Chandragupta conquer Magadha?

(1 point)
O by sending in his spies to open the city gates to his soldiers
© by attacking their borders and slowly weakening the outer reaches of the city first
© by uniting with the Greeks, combining their forces, and attacking from two directions
O by attacking with his elephants and wrecking the city

© by attacking their borders and slowly weakening the outer reaches of the city first