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
import time
import random
import shutil
import requests
import argparse

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.chrome.options import Options

from bs4 import BeautifulSoup as bs

def driver(driver_path):
    options = Options()
    options.add_argument('--headless')
    options.add_argument('--disable-gpu')
    driver = webdriver.Chrome(driver_path, options = options)
    return driver

def search_pinterest(search_text):
    chrome = driver('chromedriver.exe')
    chrome.get('https://www.pinterest.com/pin/798122365205129040/')
    
    search = chrome.find_element_by_xpath('//*[@id="__PWS_ROOT__"]/div/div/div/div[2]/div[1]/div/div[2]/div/div/form/div/div[1]/div[2]/div/input')
    search.send_keys(search_text + Keys.ENTER)
    time.sleep(random.random())

    html = chrome.page_source
    source = bs(html)

    # add scrolling algorithm following number of images to scrape
    # driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

    urls = [block.get('src') for block in source.find_all('img') if block.get('src').startswith('https://i.pinimg.com')]
    driver.close()

    return urls

def search_google(search_text):
    chrome = driver('chromedriver.exe')
    chrome.get('https://www.google.com/imghp')

    search = chrome.find_element_by_xpath('//*[@id="sbtc"]/div/div[2]/input')
    search.send_keys(search_text + Keys.ENTER)

    urls = []
    num = 1

    # add scraping for multiple images

    for i in range(num):
        img = driver.find_element_by_xpath(f'//*[@id="islrg"]/div[1]/div[{i}]/a[1]/div[1]/img')
        img.click()
        time.sleep(random.random())

        image_url = driver.find_elements_by_class_name('n3VNCb')
        if image_url.get_attribute('src')[:4].lower() == 'http':
            urls.append(image_url)

    return urls

def download(url, save_dir):
    response = requests.get(url, stream = True)
    if response.status_code == 200:
        response.raw.decode_content = True

        with open(url.split('/')[-1], 'wb') as f:
            shutil.copyfileobj(response.raw, f'{save_dir}/f')
            print('image downloaded')
    else:
        print("could not retrieve image")

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-t', 
                        '--text', 
                        default = None)
    parser.add_argument('-e', 
                        '--engine', 
                        default = 'google')
    parser.add_argument('-s', 
                        '--save_dir', 
                        default = './images')
    args = parser.parse_args()

    if args.engine == 'google':
        result = search_google(args.text)
    else:
        result = search_pinterest(args.text)

    for url in result:
        download(url, args.save_dir)
    
if __name__ == '__main__':
    main()
```

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

  A) CWE-94: Improper Control of Generation of Code ('Code Injection')
  B) CWE-1333: Inefficient Regular Expression Complexity
  C) CWE-377: Insecure Temporary File
  D) CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  E) CWE-730: OWASP Top Ten 2004 Category A9 - Denial of Service
  F) CWE-20: Improper Input Validation
Answer: F