Question $26(2$ points$)$The very first phase$/$step in data preprocessing is $\_1)$ Data reduction$2)$ Data transformation$3)$ Data consolidation$4)$ Data cleaningQuestion $27(2$ points$)$Which of the following is not among the words used to define big data?$1)$ Veracity$2)$ Velocity$3)$ Variability$4)$ Vulnerability