A financial institution with a highly regarded reputation for protecting customer interests has recently deployed a mobile payments program. Which of the following key risk indicators (KRIs) would…

The number of failed software updates on mobile devices is an operational metric, but not a primary KRI for overall risk to customer interests or the mobile payments program's financial integrity.

The percentage of incomplete transactions indicates system usability or connectivity issues, which are operational concerns, but not as directly tied to financial risk or customer protection as suspicious transactions.

The failure rate of point-of-sale systems is relevant to overall service availability, but the question specifically refers to a mobile payments program, and this KRI is less directly tied to the *mobile* program's specific risks for customer protection than suspicious transactions.

The total volume of suspicious transactions is a direct indicator of potential fraud, security breaches, or system vulnerabilities within the new mobile payments program. Given the financial institution's reputation for protecting customer interests, this KRI is paramount for the CIO to monitor, as it directly impacts customer trust, financial losses, and regulatory compliance.