A system administrator has just applied an update to an AIX system to correct a problem, The APAR number is IX49035 and was shipped as part of the PTF number U437542. After applying the APAR fix, the administrator wants to ensure that the fix is applied before informing the system users of the corrected problem. Which of the following commands should the system administrator run to verify that the APAR fix has been applied to the system?（）

• A、lslpp -f IX49035
• B、lslpp -fB U437542
• C、instfix -f IX49035
• D、instfix -ik IX49035