update answer to attack vector question

Author: reylejano

sig-security/security-audit-2021/RFP.md

@@ -162,9 +162,8 @@ The latest date to receive deliverables will be negotiated with the selected ven
 ### Which attack vectors are of most concern to the Working Group.
 
 1. The attack vector most concerned about is unauthenticated access to a cluster resulting in compromise of the [components in-scope](#project_goals_and_scope)
-2. Crossing cluster boundaries for multi-cluster configuration
-3. Crossing namespace boundaries, an authenticated attacker being able to affect resources their credentials do not directly allow
-4. Any other attack vector that exists against the components in scope
+2. Crossing namespace boundaries, an authenticated attacker being able to affect resources their credentials do not directly allow
+3. Any other attack vector that exists against the components in scope
 
 ### Is there flexibility to wait for staff to be available to work on the audit?