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My exam cloud mock exam 1 about Customer and Address vs AUCTION and Item

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I think  this question in mock exam 1 needs to be fixed:

@Entity Customer{

@Id int id;
@OneToOne Address address;
@Entity Address{
@Id int id;
Customer customer;

Given that the Customer entity maps to an Customer database table and Address entity maps to an ADDRESS database table, which statement is correct assuming there is NO mapping descriptor?

A. The relationship is mapped to a foreign key in the ITEM table.
B. The relationship is mapped using a join table AUCTION_ITEM.
C. The relationship is mapped to a foreign key in the AUCTION table.
D. The relationship is mapped to foreign keys in both ITEM and AUCTION tables.

The options do not have any Address and Customer table.
Consider Paul's rocket mass heater.
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