Many high schools are implementing new policies regarding cell phones in order to reduce distractions in the classroom. In past years, high school administrators favored a policy that banned students from carrying cell phones in
school. They enforced strict penalties if students were found with a cell phone, such as fines, confiscation, or
suspension. However, a growing number of high school administrators support policies that not only allow students to
carry cell phones but also encourage students to use them during class time in order to access educational applications
and conduct Web searches.
If the underlined phrase were deleted, the sentence would primarily lose a detail that

1. repeats information found elsewhere in the sentence

2. is necessary for the sentence to be grammatically complete

3.provides new and relevant information to the sentence

4.is ambiguous and unnecessary to the sentence