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Primary and foreign keys for the database

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What are the appropriate primary keys and given the chosen primary keys, what are the appropriate foreign keys?

branch(branch name, branch city, assets)
customer (customer name, customer street, customer city)
loan (loan number, branch name, amount)
borrower (customer name, loan number)
account (account number, branch name, balance)
depositor (customer name, account number)

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This posting answers the question on primary and foreign keys.

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What are the appropriate primary keys and given the chosen primary keys, what are the appropriate foreign keys?

branch(branch name, branch city, assets)
Primary Key: Branch Name
Appropriate Foreign keys:
• Loan. Branch name
This foreign key can be used to access the details of the Bank Branch from which the loan has been taken.
• Account.branch name
This foreign key can be used to access the details of the branch to which the account belongs from table "branch".

customer (customer ...

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