The temperatures and pressures for boiler are given below. Which of these boilers can be classified as super-critical pressure boiler?

• A. 250 psi, 150?C
• B. 100 kg/cm2, 450?C
• C. 10 kg/cm2, 150?C
• D. 150 kg/cm2, 500?C
• E. 218 kg/cm2, 540?C