Exam CISSP topic 1 question 461 discussion

The question talks only about providing access and not any systems or services. It is IDaaS for me.

IDAAS but IDP must be provided by the third party

A. just seems too obvious, and the question doesn't state what access is supposed to be provided to. It just says "access". So based on unclear wording it's A, but I think if wording was better it might be D: "with IDaaS, you get a mature solution created by subject matter experts in the field of identity and access management. You get a solution that has all the features you need to provide a secure, seamless log-in experience to your employees, customers, partners, and vendors." https://www.onelogin.com/learn/idaas#:~:text=IDaaS%2C%20or%20identity%2Das%2D,Directory%20service%20authentication

I go with A. IDaaS is the technology for providing access to third-party partners through cloud services

A. Identity as a Service (IDaaS) is most commonly employed for providing access to third-party partners through cloud services. IDaaS enables organizations to manage identities and access controls for both their internal and external users. With IDaaS, third-party partners can access the organization's resources through secure authentication and authorization mechanisms.

the answer is correct. tasked to provide "access" to third-party partners, not "access service". Employ IDaaS is a bit complex to achieve the goal.