As in the lectures, let c e r t A B cert AB denote a certificate issued by A A for B B, i.e., c e r t A B = S i g n s k A ( B , p k B ) cert AB =Sign sk A (B,pk B ). Assuming D D knows p k C pk C and trusts C C, which of the following provides evidence to D D that A A's public key is p k A pk A ? c e r t A B cert AB , p k A pk A , c e r t B C cert BC , and p k B pk B . c e r t C B cert CB , p k B pk B , c e r t B A cert BA , and p k A pk A . c e r t C B cert CB , p k B pk B , c e r t A B cert AB , and