✅ entity framework return all objects

Hello,
If I use entity framework and I want to get all objects in my repository, what should I do?

1:

private IEnumerable<TrainName> GetTrainNames()
{
    return _dbStorage.TrainNames;
}

private IEnumerable<TrainName> GetTrainNames()
{
    return _dbStorage.TrainNames;
}

private async Task<IEnumerable<TrainName>> GetTrainNames()
{
    return await _dbStorage.TrainNames.ToListAsync();
}

private async Task<IEnumerable<TrainName>> GetTrainNames()
{
    return await _dbStorage.TrainNames.ToListAsync();
}

Or something else?