Suppose $(1,1)$ is a critical point of a function f with continuous second derivatives. In each case, what can you say about r$?($a$)[$xx$(1,1)=9,[$xy $(1,1)=3,$ fy $(1,1)=2$ The critical point $(1,1)$ is a local minimum. The critical point $(1,1)$ is a local maximum. The critical point $(1,1)$ is a saddle point. Nothing can be determined about the critical point $(1,1).($b$)[$xx $(1,1)=9,[$xy $(1,1)=5,$ fyy $(1,1)=2$ The critical point $(1,1)$ is a local minimum. The critical point $(1,1)$ is a local maximum. The critical point $(1,1)$ is a saddle point. Nothing can be determined about the critical point $(1,1).$