"But at the present day none of our subjects may use unrestrained violence towards their slaves, except for a reason recognized by law. For, by a constitutio of the Emperor Antoninus Pius, he who without any reason kills his own slave is to be punished equally with one who has killed the slave of another.”
--The Institutes, Book I, Chapter VIII

According to the above law from the Justinian Code, which of the following statements is true?

Violence towards slaves was not tolerated under any circumstances.
Masters were not allowed to kill their slaves without a lawful reason.
Masters were allowed to kill another master’s slaves if they had a reason for doing so.
Unrestrained violence against slaves was allowed by law.

Question

"But at the present day none of our subjects may use unrestrained violence towards their slaves, except for a reason recognized by law. For, by a constitutio of the Emperor Antoninus Pius, he who without any reason kills his own slave is to be punished equally with one who has killed the slave of another.”
--The Institutes, Book I, Chapter VIII

According to the above law from the Justinian Code, which of the following statements is true?

Violence towards slaves was not tolerated under any circumstances.
 Masters were not allowed to kill their slaves without a lawful reason.
 Masters were allowed to kill another master’s slaves if they had a reason for doing so.
 Unrestrained violence against slaves was allowed by law.