Answer: Filing for bankruptcy is regarded as a secondary liquidity source.

**Explanation:** - **Option A** is correct because secondary sources of liquidity include actions such as filing for bankruptcy protection and reorganization. These measures can serve as liquidity tools, allowing a company under bankruptcy protection to continue operations by generating cash flow until a restructuring plan is approved. - **Option B** is incorrect because primary sources of liquidity are more cost-effective and readily accessible. Secondary sources, such as asset liquidation, often indicate financial distress and come with higher costs, such as relinquishing company assets. - **Option C** is incorrect because primary liquidity sources do not typically disrupt a company's normal operations, whereas secondary sources may lead to significant changes in financial and operational positions.

Author: LeetQuiz Editorial Team