I would grade the given answer as follows:

**Accuracy:**
The answer accurately lists the tasks present in the given BPMN 2.0 XML. Each task element with its corresponding "id" and "name" attributes is correctly identified.

**Readability:**
The tasks are presented in a clear and concise manner with both the ID and name attributes listed.

**Completeness:**
The solution provides all the necessary information, showing no omission of tasks from the provided BPMN XML.

**Handling of the XML Complexity:**
The answer demonstrates a good understanding of the XML structure and correctly extracts the relevant information.

Based on these points, the answer demonstrates clear understanding and accuracy in listing the tasks. Therefore, I would grade this answer at **9.5 out of 10.0**. The slight deduction is only for not explicitly explaining the approach or assumptions made during the extraction, even though the essential information is correctly captured.