Data access sets are collections of ledgers that define the data security for users who access General Ledger.
Users can only access the ledgers that are assigned to them through data access sets. To allow users with the General Accountant job role to access the UK Ledger, you need to create a data access set that includes the UK Ledger and assign it to the user/role combination. You also need to specify the access privilege for the data access set, which can be Full Ledger, Both Read and Write, or Read Only. In this case, you need to select Both Read and Write to allow read/write access to the full ledger. References:
* Implement General Ledger
* GL_ACCESS_SET_LEDGERS
* The Default Data Access Set
* Overview of General Ledger Security

The two valid Data Access Set types are Full access and Read Only access. A Data Access Set is a security feature that defines the access level that users have to ledger data, such as balances, budgets, or journals. A Data Access Set type is an attribute that determines the type of access that users have to ledger data within a Data Access Set. The two valid Data Access Set types are Full access and Read Only access. Full access allows users to view and enter data for ledger data within a Data Access Set. Read Only access allows users to view but not enter data for ledger data within a Data Access Set. Full Ledger is not a valid Data Access Set type, but an option that determines whether a Data Access Set grants access to all balancing segment values in a ledger or only specific balancing segment values. Primary Balancing Segment Value is not a valid Data Access Set type, but an attribute that identifies the legal entity or business unit for which financial statements are prepared and balanced. Read and Write access is not a valid Data Access Set type, but an alternative term for Full access. Reference: Oracle Financials Cloud: General Ledger 2022 Implementation Professional Objectives - Define Ledgers 12

According to Oracle documentation, when there is a business requirement for a subsidiary company to report to the parent company on a monthly basis with different currencies and no requirement to have daily balances, you should recommend Balance level as the data conversion level. A Balance level data conversion level enables you to translate balances from one currency to another at month-end or quarter-end for reporting purposes. A Balance level data conversion level minimizes the data stored in the reporting currency because it does not store daily balances or journal details. Therefore, option D is correct. Option A is incorrect because a Subledger level data conversion level stores daily balances and journal details in the reporting currency.
Option B is incorrect because a Journal Level data conversion level stores journal details in the reporting currency. Option C is incorrect because an Adjustment only level data conversion level does not translate balances from one currency to another. Option E is incorrect because a Spreadsheet level data conversion level does not exist.