Answer: Renegotiating current debt contracts to lower interest payments

## Explanation In corporate finance, liquidity sources are categorized as primary or secondary: **Primary sources of liquidity** include: - Cash and cash equivalents - Short-term investments - Bank lines of credit - Efficient cash flow management **Secondary sources of liquidity** involve more drastic measures that may impact the company's operations or financial structure, such as: - Renegotiating debt contracts - Liquidating assets - Filing for bankruptcy protection - Debt restructuring **Analysis of each option:** **A. Increasing the availability of bank lines of credit** - This is a primary source of liquidity. Bank lines of credit are typically arranged in advance and represent readily available funding. **B. Increasing the efficiency of cash flow management** - This is also a primary source of liquidity. Better cash flow management improves the company's ability to meet short-term obligations without external intervention. **C. Renegotiating current debt contracts to lower interest payments** - This is a secondary source of liquidity. Renegotiating existing debt contracts involves restructuring obligations, which is typically done when a company faces financial stress and needs to improve its liquidity position through more significant measures. **Key takeaway:** Secondary sources of liquidity are typically more costly, less reliable, and may signal financial distress, whereas primary sources are more readily available and less disruptive to normal business operations.

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