What is a difference between SOAR and SIEM?

What is a difference between SOAR and SIEM?

A. SOAR platforms are used for threat and vulnerability management, but SIEM applications are not B. SIEM applications are used for threat and vulnerability management, but SOAR platforms are not C. SOAR receives information from a single platform and delivers it to a SIEM D. SIEM receives information from a single platform and delivers it to a SOAR