Which of the following recommendations are advocated to get the most out of performance appraisals $($PAs$)?$

a$.$ Performance measures should be tailored to the needs of the job.

b$.$ Differentiation between employees should be maximised.

c$.$ The PA system should be aimed at group$-$based rather than individual$-$based evaluation.

d$.$ Performance measures should be tailored to the needs of the organisation.

Choose the correct option

$1.$ b and c

$2.$ a and c

$3.$ c and d

$4.$ a and b