Verbal - Odd Man Out

DIRECTIONS : In this oddman out section we need choose the word or pair that different from remaining words or pairs.
6. Select the odd one out
  A.  SMTP
  B.  WAP
  C.  SAP
  D.  ARP
7. Select the odd one out
  A. Oracle
  B. Linux
  C. Ingress
  D. DB2

8. Select the odd one out
  A.  LINUX
  B.  UNIX
  C.  SOLARIS
  D.  SQL SEVER
9. Select the odd one out
  A.  SQL
  B.  DB2
  C.  SYBASE
  D.  HTTP
10. Select the odd one out
  A.  WAP
  B.  HTTP
  C.  BAAN
  D.  ARP