AMD Verification Engineer interview questions

You are given the following linked list: A->B->C->D->E->NULL. The head points to C currently, and C needs to be deleted while keeping the structure of the linked list intact. Note: This is a singly linked list.

UVM question : Assuming, UVM environment has 3 different agents having scope to their own interfaces. On driving wrong stimuli on agent1, there will be error pin asserted on interface3(monitor of agent2 sees this). soon after error-pin assertion, there should be a read transaction from agent2. How do you make sure your agent2 drives a read transaction on every wrong stimulus from agent1, which was seen on a monitor of agent2 ?