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
"""Class for dropbeat app api custom extensions

"""
from django.conf import settings
from django.conf.urls import url, include
from django.core.exceptions import ImproperlyConfigured
from django.core.urlresolvers import reverse
from django.http import HttpResponse, HttpResponseBadRequest


class ApiError(Exception):
    pass


class Api(object):
    """Implements a registry which ties together the various resources making
    up an API.
    Optionally supplying `api_name` allows you to name the API.
    Usually, version numbers are used as the name. (i.e. `v1`, `v2`, etc.)

    """
    def __init__(self, api_name=None):
        self.api_name = api_name
        self._registry = {}
        self._additional_urls = []

    def register(self, resource):
        """Registers an instance of a `Resource` subclass with the API.

        """
        resource_name = getattr(resource, 'name', None)

        if resource_name is None:
            raise ImproperlyConfigured(
                "Resource %r must define a 'resource_name'." % resource)

        self._registry[resource_name] = resource

        return self

    def unregister(self, resource_name):
        """If present, unregisters a resource from the API.

        """
        if resource_name in self._registry:
            del(self._registry[resource_name])

    def wrap_dispatcher(self, view):
        def wrapper(request, *args, **kwargs):
            try:
                return getattr(self, view)(request, *args, **kwargs)
            except Exception as e:
                return HttpResponseBadRequest(e)
        return wrapper

    def prepare_urls(self):
        """A hook for adding your own URLs or matching before the default URLs.

        """
        return []

    def top_level(self, request, api_name=None):
        return HttpResponse('You are looking under the hood')

    @property
    def urls(self):
        """Provides URLconf details for the `Api` and all registered
        `Resources` beneath it.

        """
        if self.api_name is not None:
            pattern_list = [
                url(r"^(?P<api_name>%s)$" % (self.api_name),
                    self.wrap_dispatcher('top_level'),
                    name="api_%s_top_level" % self.api_name),
            ]

            for name in sorted(self._registry.keys()):
                self._registry[name].api_name = self.api_name
                pattern_list.append(
                    url(r"^(?P<api_name>%s)/" % self.api_name,
                        include(self._registry[name].urls)))
        else:
            pattern_list = [
                url(r'^$', self.wrap_dispatcher('top_level'))
            ]
            for name in sorted(self._registry.keys()):
                pattern_list.append(
                    url(r'', include(self._registry[name].urls)))


        urlpatterns = self.prepare_urls()
        urlpatterns += pattern_list
        return urlpatterns

    def _build_reverse_url(self, name, args=None, kwargs=None):
        """A convenience hook for overriding how URLs are built.

        """
        return reverse(name, args=args, kwargs=kwargs)

```

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

  A) CWE-209: Generation of Error Message Containing Sensitive Information
  B) CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  C) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  D) CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  E) CWE-94: Improper Control of Generation of Code ('Code Injection')
  F) CWE-943: Improper Neutralization of Special Elements in Data Query Logic
Answer: A