A system administrator has a patch cable with a broken RJ$45$ jack. The administrator has no replacement patch cords but has an extra RJ$45$ jack and the tools to repair the patch cord. After cutting the broken jack and removing the outer jacket, what instrument would affix the jack to the cable?

ethernet cables

a$.$

Crimper

b$.$

Loopback plug

c$.$

Punchdown tool

d$.$

Cable stripper