What will be printed?

accidental_recursion.py

# Code without call outside, without call inside
def a():
    print("a() was called")

# Code without call outside, with call inside
def b():
    print("b() was called")
    b()
    
# Code with call outside, without call inside
def c():
    print("c() was called")
c()

def d():
    print("d() was called")
    d()
d()