In an ideal Brayton cycle, air is compressed from 100 kPa and 25°C to 1 MPa, and then heated to 1200°C before entering the turbine. Under cold-air-standard conditions, the air temperature at the turbine exit is
(a) 490°C
(b) 515°C
(c) 622°C
(d) 763°C
(e) 895°C