Space is an IT company, sells a software program to a customer at $$8,500.$ It is not the only company that can install the software. The software program includes services: $(1)$ software licenses $($$$3,000),(2)$ installation services $($$$500),(3)2-$day user training $($$$4,000),$ software upgrade in next $2$ years $($$$1,000).$ Solution choices are: a$.$ One performance obligation, b$.$ Two performance obligations, c$.$ Three performance obligations, d$.$ Four performance obligations, e$.$ No performance obligations