6. Which statements are correct about cooperative evaluation techniques? 1. They are useful during the formative stages of design 2. They are a good means of eliciting user feedback on partial implementation 3. They provide quantitative feedback 4. They are effective if designers are unaware of the political and other pressures that might blas a user's response Options a. 1 and 2 only b. 2 and 3 only c. 3 and 4 only d. 1 and 4 only