Explanation

Primary sources of liquidity are typically readily available, low-cost sources of funds that a company can access without disrupting its normal operations. These include:

1. Regular credit lines - These are pre-arranged borrowing facilities with banks that provide immediate access to cash when needed.
2. Cash balances
3. Short-term investments
4. Trade credit
5. Accounts receivable collections

Secondary sources of liquidity involve more drastic measures that may impact the company's long-term operations, such as:

• Sale of operating assets - This involves selling productive assets that generate revenue, which can harm future operations.
• Renegotiation of supplier contracts - This involves changing payment terms with suppliers, which may strain relationships.
• Debt restructuring
• Bankruptcy protection

Why A is correct: Regular credit lines are a primary source because they provide immediate access to funds without disrupting business operations.

Why B is incorrect: Sale of operating assets is a secondary source because it involves selling productive assets that generate revenue, potentially harming future operations.

Why C is incorrect: Renegotiation of supplier contracts is a secondary source because it involves changing payment terms with suppliers, which may strain business relationships and is typically done when primary sources are insufficient.