Task identity refers to:

a$.$ the degree to which the job entails a variety of different activities, requiring the use of different skills and talents

b$.$ the degree to which the job requires completion of an identifiable piece of work with a visible outcome

c$.$ the degree to whcih the job has impact on the work of others

d$.$ the degree to which the job provides independence and discretion to the individual in scheduling the work and determining the procedures to use