To solve this question, the user needs to know about the parameter CM.DbConnectPoolMax which is related to concurrent database connections in the content store.
The answer to the question is:
The default value of the parameter CM.DbConnectPoolMax is -1.
Explanation:
The parameter CM.DbConnectPoolMax specifies the maximum number of concurrent database connections that are allowed to the content store. The default value of this parameter is -1, which means that there is no limit to the number of concurrent connections.
Option A (1) is incorrect because the default value of CM.DbConnectPoolMax is not 1.
Option B (0) is incorrect because the default value of CM.DbConnectPoolMax is not 0.
Option D (2) is incorrect because the default value of CM.DbConnectPoolMax is not 2.
Therefore, the correct answer is option C ( -1).