Final answer:
Landing page elements typically include user-facing components such as forms, rectangles for layout structure, and images for visual appeal. Backend tools and automation elements are not direct parts of the landing page's design.
Step-by-step explanation:
Elements that are typically found on a landing page include things such as forms for users to submit their information, visual elements like rectangles and images to make the page appealing and to convey important information visually, and iframes which can be used to embed other content like videos or forms from external sources. However, iframes, campaigns, and lead reports are more backend marketing tools, while system tokens and Smart Lists are related to the automation and personalization of marketing efforts, which are not directly part of the landing page's design. Therefore, the correct answer is forms, rectangles, and images, as these directly contribute to the user experience on the page itself.