The failures of Silicon Valley Bank and Signature Bank highlighted how mid-sized banks, which were not classified as Globally Systemically Important Banks (G-SIBs), could still pose significant risks to the financial system. Their collapse raised concerns about the adequacy of the resolution framework for these types of institutions, as they can disrupt markets and cause contagion despite not being G-SIBs.

A is incorrect. While deposit insurance played a significant role in calming depositors during the banking failures, funding adequacy was not the primary vulnerability exposed. The focus was more on the systemic risk posed by banks not classified as globally significant.

C is incorrect. While cross-border coordination can be a challenge in global banking crises, the failures in question were domestic (United States) and did not primarily expose international regulatory coordination issues.

D is incorrect. The situations with Silicon Valley Bank and Signature Bank did not involve bail-ins. Instead, their failures highlighted vulnerabilities in managing liquidity crises and market confidence, rather than over-reliance on any specific resolution tool.