$4$ a$)$ Consider the EMPLOYEE Relation shown below:E$.$No$.$GenderDNameENameGrade$522$MSalesMathewA$524$FCustomer CareClaireBPage lof $3221$TCS$001022301525$FSalesJulictB$527$MProductionAlbertC$530$MProductionEdisonA$533$FSalesElizabethA$535$FProductionMarieA$537$MCustomer CareEinsteinBExplain bitmap indexing and how it can be used to answer the following query:"Find the ENames, who are working in 'Production" department and having A grade."$($Show how the query is answered using bitmap operations and the obtained result$)$