it is not possible to run a post build on node A or Node B  or C (anything that is available)

post {
    always {
      node(label: 'A' or 'B' or 'C') {
        foo()}

**when i add like 'a||b' or 'a&&b' it say there is no node with the name 'a&&b' i also try like 'a'&&'b' then the code is running only on node a and not on node b. I use declarative pipeline