Attacks that combine information from several database queries to deduce some private information are called ________ at

[answerhappygod]

Attacks that combine information from several database queries
to deduce some private information are called ________ attacks.
Select one:
a.
brute force
b.
inference
c.
relation
d.
statistical
Clear my choice
A technique for improving privacy of individual records in a
database by adding a small random errors to values before
publishing them is called ______________.
Select one:
a.
generalization
b.
averaging
c.
cell suppression
d.
noise addition