system: You are an expert security code reviewer. You will be shown a source code file along with a multiple-choice question listing several function or class names from that file. Your task is to identify which one contains the specified CWE vulnerability.

OUTPUT FORMAT: Respond with the single letter of the correct option, wrapped in \boxed{...}. Example: `\boxed{B}`. Output the boxed letter ONLY -- no explanation, no other text.

user: ```python
#!/usr/bin/python

# Copyright 2012 Carpcomm GmbH
# Author: Timothy Stranex <tstranex@carpcomm.com>

"""Methods for uploading streams."""

import client

import logging
import threading
import subprocess
import os
import base64
import json
import httplib
import socket
import ssl
import signalling


class _PipeWaitThread(threading.Thread):
    """Thread that calls wait() on a pipe."""

    def SetPipe(self, pipe):
        self.pipe = pipe

    def SetPathToDelete(self, path):
        self.path = path

    def run(self):
        signalling.Get().SignalUploadStart()
        self.pipe.wait()
        logging.info('Upload complete.')
        signalling.Get().SignalUploadStop()
        os.remove(self.path)


def UploadAndDeleteFile(path, stream_url, rate, dtype):
    """Upload the finalized file in another process."""

    query = '?rate=%d&type=%s' % (rate, dtype)
    url = stream_url + query

    args = ['curl', '--upload-file', path, url]
    logging.info('Starting upload: %s', ' '.join(args))
    try:
        pipe = subprocess.Popen(args)
    except OSError:
        logging.exception('Error starting upload')
        return False

    if pipe.poll() is not None:
        return False

    # Although the upload is running in another process, we need to wait()
    # for it to terminate to avoid leaving defunct processes around.
    t = _PipeWaitThread()
    t.SetPipe(pipe)
    t.SetPathToDelete(path)
    t.start()

    return True


# TODO(tstranex): Consider moving this this to a new file called api.py.
class APIClient:
    def __init__(self, config):
        self._station_id = config.get(client.Client.__name__, 'id')
        self._secret = config.get(client.Client.__name__, 'secret')
        self._ca_certs = config.get(client.Client.__name__, 'ca_certificate')

        # We should consider setting default values here.
        self.SetServer(None, None)

    def SetServer(self, host, port):
        self.host = host
        self.port = port

    def GetServer(self):
        return self.host, self.port

    def _GetPostPacketRequest(self, satellite_id, timestamp, frame):
        req = {
            'station_id': self._station_id,
            'station_secret': self._secret,
            'timestamp': timestamp,
            'satellite_id': satellite_id,
            'format': 'FRAME',
            'frame_base64': base64.b64encode(frame),
            }
        body = json.dumps(req)
        return 'POST', '/PostPacket', body

    def PostPacket(self, satellite_id, timestamp, frame):
        method, path, body = self._GetPostPacketRequest(
            satellite_id, timestamp, frame)

        s = socket.create_connection((self.host, self.port))
        s = ssl.wrap_socket(
            s,
            ssl_version=ssl.PROTOCOL_TLSv1,
            cert_reqs=ssl.CERT_REQUIRED,
            ca_certs=self._ca_certs)

        c = httplib.HTTPSConnection(
            self.host, self.port, None, self._ca_certs)
        # UGLY. We have to open the socket ourselves because HTTPSConnection
        # doesn't allow us to specify all SSL parameters.
        c.sock = s
        c.request(method, path, body)
        r = c.getresponse()
        if r.status != httplib.OK:
            return False, (r.status, r.reason)

        return True, (r.status, r.reason)

```

Which of the following functions or classes contains a `CWE-327: Use of a Broken or Risky Cryptographic Algorithm` vulnerability?

  A) PostPacket
  B) SetServer
  C) SetPathToDelete
  D) _PipeWaitThread
Answer: A