In the context of instructional technology for students with physical and health disabilities, which of the following factors should be kept in mind while using assistive technology to address accessibility for instruction through environmental and object modification as suggested by Best, Reed, and Bigge?
1) Making sure materials are accessible
2) Ensuring that appliances are only activated by traditional hand controls
3) Arranging the environment to allow access for wheelchairs
4) Making sure objects are not modifiable