What is the rule that governs the use of the letters C and K in the initial position for the…

What is the rule that governs the use of the letters C and K in the initial position for the sound of /k/? (Select ALL that apply.)
I before E except after C.
When the /k/ sound is followed by an I or an E sound, it is spelled with a K.
When the /k/ sound is followed by an O, U, or A sound, it is spelled with a C.
When the /k/ sound is followed by an O sound, it is spelled with a K.