According to Baumrind's parenting-styles framework, who is the authoritative parent?

	a.	Salil rarely knows where his 10-year-old child is; when they come home, he doesn't notice.
	b.	Petula insists on bedtime at 10; but she relaxes the rules for special occasions and offers lots of love.
	c.	Ning sets firm rules, makes no exceptions, and wears a shirt that says, "Because I'm the parent."
	d.	Marty allows his child to set their own bedtime, interrupt conversations, and take a bath only when they "feel dirty."