If you want all <h4> and <h6> headers to have a black color, which CSS code would you use?
<h4>
<h6>
h4, h6 { color: black; }
h4 h6 { color: #000000; }
h4 + h6 { color: rgb(0, 0, 0); }
h4 .h6 { color: #FFFFFF; }