While Instances of Student-Led Prayer in Public Schools Have Been

While instances of student-led prayer in public schools have been allowed by the Supreme Court, what requirement or restriction has it put on that activity?

A) Students may not appear in public while praying.
B) Students must incorporate prayers from all faiths.
C) Students must pray in all languages spoken at the individual school.
D) Student religious activity may not disrupt the school.
E) Students may not pray aloud where others can hear them.