While applying a service update on a system using SMIT, the system administrates SMIT Command Status screen shows "Command: failed". Which of the following procedures should be performed to investigate the failure?（）
A. Exit the SMIT session and re-apply the update.
B. Select the SMIT option to Clean UP After an Interrupted Installation.
C. Examine the installation summary report to determine the cause of the failure.
D. Examine the console log to view the error messages generated by the failure.
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