Question: Which of the following Java code blocks can cause a concurrency issue if they are used by more than one thread in a single application?

Which of the following Java code blocks can cause a concurrency issue if they are used by more than one thread in a single
application?
public class BankAccount i
private int/ balance;
public void updatdBalance (int amount)(
this.balance = this.balance + amount;
class Object Collection 1
Hashtable
Which of the following Java code blocks can cause a concurrency

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