$1.$ Identify whether the below statements is true$/$false with a short justification. $[$Answer

should contain few bullet points$].$

$($a$)$ Data Science uses statistics and machine learning techniques for identification and

extraction of useful trends or patterns.

$($b$)$ For data collection and preprocessing, domain knowledge is essential, whereas for model

building and evaluation it is optional.

$($c$)$ As part of Feature Selection, we prefer the Features for which Variance is high.