$(10)$ Suppose cell D$6$ gives the branch of business analytic that a problem is associated with, but it gives just the abbreviation: $DA$ for descriptive analytics, $PA$ for predictive analytics, PSA for prescriptive analytics.

Write $a=IF()$ function to "translate" the abbreviation in D$6$ into its meaning. $($For example, if D$6$ contains value PA$,$ then your $=$IF$()$ function should return "predictive analytics".$)$