How is the ternary operator evaluated in JavaScript? -

regarding ternary (? :) operator in javascript, know how evaluated typical browser's javascript interpreter:

alternative a:

1. evaluate first operand.
2. if result of first operand true, evaluate , return second operand.
3. else, evaluate , return third operand.

alternative b:

1. all 3 operands evaluated.
2. if result of first operand true, return result of second operand.
3. else, return result of third operand.

alternative c:

of course, if neither alternative nor alternative b accurately describe how ternary operator works, please explain me how works.

the "alternative a":

(1)? functionone(): functiontwo() 

if put simple alert message on both functions, functionone display message.

function functionone(){     alert("one"); } function functiontwo(){     alert("two"); }