Hi , While practicing the Mock test by pmstudy I am getting confused and not satisfied with the answer provided so, Pl. suggest the best answer with explanation :

Q1- Which of the following statements about Control Quality is accurate?

A. Prevention refers to keeping errors out of the process, whereas inspection refers to keeping errors out of the hands of the customer.

B. Attribute sampling determines whether the result conforms or not, and variables sampling determines the degree of conformity.
C. Tolerances refer to a specified range of accepted results and control limits refer to thresholds, which can indicate whether the process is out of control.
D. Control Quality is only performed during the Monitoring and Controlling phase of a project.
 Options are as :

1. Option B,C & D

2. Option A,C & D

3. Option A, B & D

4. Option A, B & C

Q2. As a buyer, during Control Procurements, you have recently conducted an audit of your seller to determine weaknesses in the seller`s processes that need to be corrected. You want to document the results of the audit and the communications with the seller. This should be done using: 

1. Performance reports

2. Correspondence

3. Change requests

4. Procurement audits

One more doubt - Who can make change into Project Charter ???

Pl. suggest /Explain.