QA means quality analysis , its a team in an organisation 
where they analise the testing quality and they set some 
standards for testing to improve the testing process ,

QC means quality centre its a tool similar to Test director 
Qc is used for maintaing test cases and witing test cases 
etc i acn say improved version of Test director

Here QA means Quality Assurance&QC meansQuality Control.

QA means Quality assurance. its a policy of the company to 
assure the cient that the product is safe and upto the 
clients requirement.QA is process that give the conformance 
of the perfect product.

QC means Quaity Control the steps we r taking to make the 
product user friendly and Qualitative,that  means the 
actual testing conducted by us.
It is my view
if any body kbnow the answer then post me.