You may link independent clauses with a coma or a coordinating conjunction

FALSE:

You may link independent clauses with a comma or a coordinating conjunction.

TRUE:  

You may link independent clauses with a comma AND a coordinating conjunction.

Explanation:

Example:

I have answered your question, and now you are smarter because of it.

b

explanation:

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.