a$)$ Consider the EMPLOYEE Relation shown below:$(5)$E$.$NoGender DNameENameGrade$522$MSalesMathewA$524$FCustomer Care ClaireBPage lof $3221$TCS$001022301325$SalesJulierB$527$MProductionAlbertC$530$MProductionEdisonA$533$FSalesElizabethA$535$FProductionMarieA$537$MCustomerCareEinsteinBExplain 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