A$($n$)\_\_\_\_\_\_\_\_$ system connects existing systems by providing middleware software to allow multiple applications to connect and share data.

Question $3$ options:

$1)$

ERP $($Enterprise Resource Planning$)$

$2)$

SCM $($Supply Chain Management$)$

$3)$

EAI $($Enterprise Application Integration$)$

$4)$

CRM $($Customer Relationship Management$)$