Please use insurance database below with 3 relations to answer questions.

1. Find customers (their names) who have beneficiaries older than themselves. There are two answers, one with tuple relational calculus and one with domain relational calculus.

2. Which customer (their names) dont have any car insurance? There are two answers, one with tuple relational calculus and one with domain relational calculus.

3. Who can buy all the insurance policies provided by AD06. (their names) There are two answers, one with tuple relational calculus and one with domain relational calculus.

4. Convert the below relational algebra relation into TRC and DRC in English:

Thank you :)

Customer: CustomerID (string) Name (string) Age (integer) Gender (one of male, female) Nationality (string, nullable) Education Level (integer, nullable) Profession (string, nullable) City (string) State (string) Address (string) Insurance Contract: ContractID (string) Start Year (integer) Stop Year (integer) Provider Code (foreign key to Policy) InsuranceType (foreign key to Policy) CustomerID (foreign key to Customer) Beneficiary (foreign key to Customer) Policy: ProviderCode (string) InsuranceType (string) AnnualFee (float) MaxCoverage (float) CanDuplicate (bool) MinEducation Level (integer, the limitation to buy the insurance) A Name(O Gender="male" (Customer) na O StartYear=2021 (InsuranceContract) (Insurance Contract) 1 0 MinEducation Level>2(Policy)) Customer: CustomerID (string) Name (string) Age (integer) Gender (one of male, female) Nationality (string, nullable) Education Level (integer, nullable) Profession (string, nullable) City (string) State (string) Address (string) Insurance Contract: ContractID (string) Start Year (integer) Stop Year (integer) Provider Code (foreign key to Policy) InsuranceType (foreign key to Policy) CustomerID (foreign key to Customer) Beneficiary (foreign key to Customer) Policy: ProviderCode (string) InsuranceType (string) AnnualFee (float) MaxCoverage (float) CanDuplicate (bool) MinEducation Level (integer, the limitation to buy the insurance) A Name(O Gender="male" (Customer) na O StartYear=2021 (InsuranceContract) (Insurance Contract) 1 0 MinEducation Level>2(Policy))