Correct way to call asynchronous method from synchronous

Good afternoon.

I looked at many articles on this topic, one still has no complete understanding.

I have an asynchronous method, for example:

public Task<Customer> Get(int id)
{
    return await client.GetCustomer(id);
}

I have a synchronous method that should call an asynchronous method, for example:

public Order GetOrder()
{
   //Invoking Asynchronous Method and Defining Customer Variable
   
   return new Order { Customer = customer};
}

Question: What is the best way to make this call?

P.S. There are the following ways:

1.First way

var customer = Get(10).Result;

2.Second way

var customer = Get(10).GetAwaiter().GetResult();

3.Third way

var customer = Task.Run(async()=>await Get(10)).Result;

4.Fourth way - Apply the RunSync method of the AsyncHelper class (AsyncHelper from Microsoft)

var customer  = AsyncHelper.RunSync(()=>Get(10));

Note - here under the hood creation and execution of Task

5.The fifth way - Apply the Run method of the AsyncContext class library Nito.AsyncEx

var customer  = AsyncContext.Run(()=>Get(10));

I would like to get a short and reasoned answer.