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
#Eric Jacobson
#erjacobs@redhat.com
#29 June 2018
#
#Watch endpoints as a service (WEaaS)
#


import itertools
import resources.rabbitListener as listener
import sys
import threading
import logging
from yaml import load
from flask import Flask, Response, request
from resources.client import Client
from keystoneauth1 import identity
from keystoneauth1 import session
from keystoneauth1.identity import v3
from keystoneclient.v3 import client as keyClient


app = Flask(__name__) 


pathToYamlConfig = 'config.yml'
D = {}


#Debug log (prints to stdout)
app.logger.addHandler(logging.StreamHandler(sys.stdout))
app.logger.setLevel(logging.DEBUG)

#Note: use app.logger.debug("hello world") to print messages to stdout

############################################################################


@app.route('/')
def needsEndpoint():
    """No endpoint given"""
    return 'No endpoint specified in the URL!\n'


@app.route('/<endpoint>')
def index(endpoint):
    """Adds a deque to the shared dictionary, D, and performs a
    transfer via http back to client"""

    app.logger.debug('Request made for %s events.' % endpoint) 

    #Authenticate client
    #x_auth_token = request.headers.get('X-Auth-Token')
    #a = authenticate(x_auth_token)
    #if a == 1:
    #    return "Unauthorized request.\n"

    if endpoint not in D.keys():
        return 'Invalid endpoint!'

    #Initialize client object
    C = Client()

    #Generate a chunked http response for the client
    def generate():
        """Generator with an infinite loop listening for events in D"""
        addDequeToDict(endpoint, C)

        while True:
            if len(C.deque) > 0:
                event = C.deque.popleft()

                try:
                    yield str(event) + '\n\n'
                except GeneratorExit:
                    app.logger.debug('Detected client disconnect.')
                    break

        #Remove the client's deque from the shared dictionary
        D[endpoint].remove(C.deque)

    return Response(generate(), mimetype='application/json')


############################################################################


def authenticate(x_auth_token):
    """Attempts to authenticate client using keystoneauth1"""
    try:
        auth_url = 'http://192.168.2.4/identity'
        project_id = 'demo'
        auth = identity.Token(auth_url, token=x_auth_token, project_id=project_id)
        sess = session.Session(auth=auth)
        ks = keyClient.Client(session=sess, project_id=project_id)
        ks.authenticate(token=x_auth_token)
        app.logger.debug('Request authorized')
        return 0
    except Exception as ex:
        app.logger.debug('Request unauthorized!\n') 
        return 1


def addDequeToDict(endpoint, C):
    """Initialize an empty deque for a client in the shared dictionary"""
    if endpoint in D.keys():
        D[endpoint].append(C.deque)
        return 'Added event queue to %s key.\n' % endpoint
    else:
        return 'Invalid endpoint!\n'


def readYaml():
    """Returns a list of endpoints from config.yml"""
    config = load(file(pathToYamlConfig, 'r'))
    listsOfEndpoints = [config[service] for service in config]
    endpoints = list(itertools.chain.from_iterable(listsOfEndpoints))
    return endpoints


def initializeDict(endpoints):
    """Initializes the shared dictionary to store endpoint data"""
    for endpoint in endpoints:
        D[endpoint] = []


def configureListener():
    """Configure and start up listener"""
    #Initialize shared dictionary D with endpoints
    endpoints = readYaml()
    initializeDict(endpoints)

    #Create and start up listener thread
    worker = listener.createListener(D)
    startListener = threading.Thread(target=worker.run, name='Listener').start()

configureListener()


############################################################################

```

Which of the following functions or classes contains a `CWE-117: Improper Output Neutralization for Logs` vulnerability?

  A) index
  B) configureListener
  C) needsEndpoint
  D) generate
Answer: A