Sorry, I will try to explain it better.
In the context of OCSP comunication, when I construct a CertID for OCSP request I must use the certificate to evaluate (that I called certToVal) and its issuer certificate (that I called issuerCert).
My first question: when we talked about the issuer certificate of the certificate to evaluate, we talked about
 The certificate that corresponds with the field âIssuerâ of the certificate to evaluate?
 The certificate that appears in AuthorityKeyIdentifier extension of certificate to evaluate?
 The certificate that appears in field "id-ad-caIssuer" of "authorityInfoAccess" extension of certificate to evaluate?
 The CA certificate?
(( I was sure that  was the suitable answer, because in Chapter 7 as in RFC 2560 is explained thus, but I have this doubt because in a test certificate the issuer certificate that it had to use to create CertID of OCSP request (and to obtain an OCSP response) was the corresponding one to  ))
Thanks you very much.
Valencia - Spain