Explanation

In financial reporting, issuers typically provide less detailed disclosures about operating costs compared to revenue disclosures. This is because:

1. Revenue recognition is a critical area with specific accounting standards (such as ASC 606/IFRS 15) that require detailed disclosure about revenue streams, contract balances, performance obligations, and disaggregation of revenue.

2. Operating costs are often aggregated into broader categories (like cost of goods sold, selling, general and administrative expenses, research and development) without the same level of detailed breakdown required for revenue.

3. Regulatory requirements focus more on revenue transparency due to its importance in assessing a company's core business performance and potential for manipulation.

4. Management discretion in classifying operating expenses allows for more aggregation, whereas revenue recognition principles demand more specific disclosures.

Therefore, option A is correct: issuers' disclosures about operating costs are most likely less detailed than their revenue disclosures.