Gloria, an entrepreneur who owns the Sebenza Cleaning Company, has just secured a five$-$year contract with the Alex Shopping Centre to clean the building. Gloria needs to know what resources are required to provide cleaning services to the shopping centre for the next five years. $\_\_\_\_\_\_\_$ are the most relevant management skills for performing this function.

a$.$

Project management skills

b$.$

Planning skills

c$.$

Human relations skills

d$.$

Organisational skills