In Iowa, where is it illegal to carry a weapon, even with a carry permit?

In Iowa, carrying a weapon is illegal under certain circumstances, including on the grounds of a school. This can include elementary, middle, and high schools, as well as colleges and universities. The other options are incorrect because they do not specify a location where carrying a weapon would be illegal, whereas D specifically mentions the grounds of a school. Additionally, A, B, and C may be legal in some circumstances with a valid carry permit, whereas D is always illegal regardless of whether or not you have a permit. It is important to follow state and local laws regarding weapons and permits to avoid any legal issues.