For IBM Cloud offerings, who has the responsibility for managing the lifecycle, operations, and security?

In IBM Cloud®, as is the case for other cloud service providers, the responsibilities for managing the lifecycle of, operating, and securing products are shared between IBM® and the customer.

https://cloud.ibm.com/docs/overview?topic=overview-shared-responsibilities#:~:text=The%20software%20deployment%20control%20plane,of%20deployed%20software%20package%20instances .