Legacy systems are integrated with newer systems by using $\_\_\_\_\_\_\_\_$ approach$($es$).$

Question $10$ options:

a$)$

Middleware

b$)$

Virtualization

c$)$

Software Oriented Architecture $($SOA$)$

d$)$

Chaotic computing

e$)$

Two of above $($a$)$ and $($c$)$