code: def verify_rsa_key(rsa_key: str, email: Optional[str]) -> str:
      """Fetch the KEYS file and verify if the RSA key and email match."""
      url = "https://downloads.apache.org/superset/KEYS"
      response = requests.get(url)
      if response.status_code == 200:
          if rsa_key not in response.text:
              return "RSA key not found on KEYS page"
  
          # Check if email is None or not in response.text
          if email and email in response.text:
              return (
                  "RSA key and email verified against Apache KEYS file"
              )
          elif email:
              return (
                  "RSA key verified, but Email not found on KEYS page"
              )
          else:
              return "RSA key verified, but Email not available for verification"
      else:
          return "Failed to fetch KEYS file"
  
file_path: superset/RELEASING/verify_release.py
imports: import re
  import subprocess
  import sys
  from typing import Optional
  import requests
label_desc: Use image node_id 5 for calling a global function with example usage: verify_rsa_key(rsa_key, email) and returns: str, str, str, str, str