$7$B$.9\mathrm{.}1$ Read the following $3$ statements:

a$)$ Benchmarking is the practice of studying the various methods that competitors may be using and then adopting the best.

b$)$ The installation of newer and better machines is one way to improve productivity,

c$)$ Human resource policies and work ethic have an impact on the productivity of employees.

Which of the above statements is$/$are correct?

$[1]b$ and $c$

$[2]$ a and c

$[3]$ a and $b$

$[4]$ a$,$ b and c

$[5]$ Not $1,2,3$ or $4$