Connecting a SFP28 NIC to a SFP+ Switch

Hey guys, I'm a Sysadmin that needs your help!

I have to configure an Application Server that should be connected with 10Gbit/s to SFP+ Ports on our HPE Aruba Switches. But for the specific server only NICs with SFP28 and 25Gbit/s are available from the manufacturer, which we never used yet.

It seems SFP28 is in general compatible with SFP+. Is it correct, that I...

1) ...can use a SFP+ Module/Tranceiver on both sites including the SFP28 NIC Port without problems?

2) ...can use a SFP28 Module/Tranceiver on both sites including the SFP+ Switch Port without problems?

3) ...can use a SFP28 Module/Tranceiver on the NIC and a SFP+ Module/Tranceiver on the SFP+ Switch Port?

Thanks!