code: def resource_name(self, product: str) -> Optional[str]:
      version = self.latest_version(product)
      assert version is not None, (product, str(self._product_versions))
      return product_version_to_resource(product, version)
  
file_path: hail/batch/batch/driver/billing_manager.py
imports: import abc
  import logging
  from dataclasses import dataclass
  from typing import Dict, List, Optional
  from gear import Database, transaction
  from .pricing import Price
label_desc: Use image node_id 4 for calling the ProductVersions obj's underlying member method code with example usage: obj.resource_name(product) and returns: product_version_to_resource