Which of the following is incorrect regarding inbreeding?

$A$ mule is the result of .......

$A$ cross between a superior male of one breed and a superior female of another breed is called:

Give scientific reasons: Inbreeding is necessary to obtain a pure line.

Outcrossing refers to ...

Strategic steps for inbreeding are:
$I$. Identify superior male and superior female of the same breed.
$II$. These are then mated in pairs.
$III$. Evaluate the progeny obtained from the mating to identify superior males and females.
$IV$. In cattle, a superior female is the cow or buffalo that produces more milk per lactation, and a superior male is the bull that gives rise to superior progenies.
$V$. Superior progenies obtained are further mated.
Arrange the above given steps in the correct sequence and select the correct answer.