1. The following is an X.509 certificate. (20pt) Certificate Data: Version: 3 (0x2) Seria1 Number: 3d:0e:98:b2:bf : af:fa : 9e : 99:91:05:64:69:6e : 11 : 2a Signature Algorithm: sha256WithRSAEncryption Issuer: C-US, O-Symantec Corporation, OU Symantec Trust Network, CN-Symantec Class 3 EV SSL CAG3 Validity Not Before: Aug 14 00:00:00 2017 GMT Not After Sep 13 23:59:59 2018 GMT Subject: C-US/postalCode-22230, ST-Virginia, L-Arlington/street-4201 Wilson Blvd, O=National Science Foundation, OU-DIS, CN-www.nsf.gov Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (2048 bit) Modulus: 00:ca: fb:26: 78:06:25:bl: 9e: 67:1d: 69:0b:10:06: cf:25:b6:7d:de:8e:56:80:el:1c:38:52:62:43:fd: Exponent: 65537 (0x10001) Signature Algorithm: sha256WithRSAEncryption 4b:0d: 62:11:b4:dc:78:09:12:c1:1b:24:ff:98:43:58:1c:54: Oa:34:be:8f: 3f:12:8f:17:4a:fe:5b:26:13:1a:5f:a7:87:ad: ba : 2 c : 10 : c 7 : bc : 8b : 2c:15:6e : 0c : d2 : d0:8b : 74 : 52:c8:ed : 05 : Ob:9b:62:41 a) Who issues the certificate? b) Who is the owner of the certificate? c) Who generated the signature on this certificate, and how can this signature be verified? d) Before issuing the certificate, the CA needs to do a verification regarding the subject field. Please describe what this verification is, and why it is necessary