To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Transaction files transferred between the Server and Mobile Client - This option is correct. .dx files are transaction files that are transferred between the Server and Mobile Client in certain software systems.
Option B) Temporary files that are automatically purged upon application exit - This option is incorrect. .dx files are not typically temporary files that are automatically purged upon application exit.
Option C) Directory files used by Siebel to organize physical file directories - This option is incorrect. .dx files are not directory files used by Siebel to organize physical file directories.
Option D) Log files used for troubleshooting EIM process errors - This option is incorrect. .dx files are not specifically log files used for troubleshooting EIM process errors.
The correct answer is Option A) Transaction files transferred between the Server and Mobile Client. This option is correct because .dx files are indeed transaction files that are transferred between the Server and Mobile Client in certain software systems.