To list all dump files in memory, the correct command is "dump info".
Let's go through each option to understand why it is correct or incorrect:
Option A) dump error - This option is incorrect because "dump error" is not a valid command to list dump files in memory.
Option B) dump info - This option is correct because "dump info" is the command used to list all dump files in memory.
Option C) dump list - This option is incorrect because "dump list" is not a valid command to list dump files in memory.
Option D) All of the above - This option is incorrect because only option B (dump info) is the correct command to list dump files in memory.
The correct answer is B) dump info. This option is correct because it is the command used to list all dump files in memory.