Lemon v. Kurtzman established the Lemon test in 1971, which defined criteria under which government aid to religious schools would be acceptable. Which of the following criteria are included in the test?
a. The primary effect must neither advance nor inhibit religion
b. The aid must have a secular legislative purpose
c. The aid must not result in excessive government entanglement with religion
d. The aid must be unanimously approved by the Supreme Court