system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
#!/usr/bin/env python3
import datetime
import time

from twilio.rest import Client

import creds
import number_list

debug = True

if not debug:
    client = Client(creds.creds['account_sid'], creds.creds['auth_token'])


# This is the actual call method used.
def make_call(n, client, t_number, s_number, twiml):
    client.calls.create(
        to=s_number,
        from_=t_number,
        twiml=twiml,
        record=True,
        machine_detection='Enable'
    )

    print(
        f"Call: {n} | {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')} - Placed a call using twilio's {t_number}"
        f" to scammer number {s_number} with {twiml}")


def test_call(n, t_number, s_number, url):
    print(
        f"Call: {n} | {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')} - Placed a call using twilio's {t_number}"
        f" to scammer number {s_number} with {url}")


# This is the method which loops through your active Twilio phone numbers and makes calls as often as set in seconds,
# and loops as many times specified.

def flood_scammer(loops, seconds, twiml):
    print(f'The following number(s):')
    for i in number_list.scammer_phone_number:
        print(f'{i},')
    print(f'Will be called by the following number(s):')
    for x in number_list.twilio_active_phone_numbers:
        print(f'{x},')
    print('\n')
    n = 1
    # You can change 'range(x)' number to loop as many times as you want.
    for i in range(loops):
        for twilio_number in number_list.twilio_active_phone_numbers:
            for scammer_number in number_list.scammer_phone_number:
                if debug:
                    test_call(n, twilio_number, scammer_number, twiml)
                    n += 1
                else:
                    make_call(n, client, twilio_number, scammer_number, twiml)
                    n += 1
                time.sleep(seconds)  # Change how long to wait to call again in seconds


if __name__ == '__main__':
    flood_scammer(loops=100,  # loops * total Twilio nums * Scammer nums
                  seconds=0.5,  # Time before next call.
                  # A url with a valid xml playback message
                  # EX: https://www.twilio.com/console/runtime/twiml-bins
                  twiml="""<Response><Say>This is a test voice response.</Say></Response>""")

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-611: Improper Restriction of XML External Entity Reference
  B) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  C) CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  D) CWE-312: Cleartext Storage of Sensitive Information
  E) CWE-730: OWASP Top Ten 2004 Category A9 - Denial of Service
  F) CWE-116: Improper Encoding or Escaping of Output
Answer: D