Consider the following relational query on the above database:
SELECT S.sname
FROM Suppliers S
a WHERE S.sid NOT IN (SELECT C.sid 
     FROM Catalog C
     WHERE C.pid NOT IN (SELECT P.pid
             FROM Parts P
             WHERE P.color < > ‘blue’))
Assume that relations corresponding to the above schema are not empty. Which of the following is the correct interpretation of the above query?

A

Find the namesof all suppliers who have supplied a non-blue part

B

Find the namesofall suppliers who have not supplied a non-blue part

C

Find the namesofall suppliers who have supplied only non-blue parts

D

Find the namesofall suppliers who have not supplied only non-blue parts