When choosing which technique to use in a given situation, which factors should be taken into account?

U previous experience of types of defects found in this or similar systems

V the existing knowledge of the testers

W regulatory standards that apply

X the type of test execution tool that will be used

Y the documentation available

Z previous experience in the development language

Question $2$ options:

U$,$XandY

V$,$W$,$YandZ

U$,$ V$,$ W and Y

V$,$W and Y