Which of the following observations reflect colligative properties?

Water boils at a higher temperature in a pressure cooker.

0.5 M NaCl solution has higher vapour pressure that 0.5 M ${\mathrm{BaCl}}_2$ solution.

0.25 M ${\mathrm{H}}_2{\mathrm{SO}}_4$ solution freezes at a lower temperature than pure water

Pure water freezes at a higher temperature than pure methanol.