Which are the PMBOK Knowledge Areas

$($Multiple Answer $-$ SELECT ALL that Apply$)$

a$).$ Communication and Stakeholders

b$).$ Corporate Taxation

c$).$ Health Safety and Environment

d$).$ Human Resource Management

e$).$ Integration

f$).$ Procurement and Resource

g$).$ Quality and Risk

h$).$ Reliability Engineering

i$).$ Research and Development

j$).$ Scope, Schedule and Cost