D.2.

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.90</version>
</plugin>

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.90</version>
</plugin>

mvn fabric8-camel:validate

mvn fabric8-camel:validate

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.80</version>
  <executions>
    <execution>
      <phase>process-classes</phase>
    <goals>
      <goal>validate</goal>
    </goals>
    </execution>
  </executions>
</plugin>

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.80</version>
  <executions>
    <execution>
      <phase>process-classes</phase>
    <goals>
      <goal>validate</goal>
    </goals>
    </execution>
  </executions>
</plugin>

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.80</version>
  <executions>
    <execution>
      <configuration>
        <includeTest>true</includeTest>
      </configuration>
      <phase>process-test-classes</phase>
      <goals>
        <goal>validate</goal>
      </goals>
    </execution>
  </executions>
</plugin>

<plugin>
  <groupId>io.fabric8.forge</groupId>
  <artifactId>fabric8-camel-maven-plugin</artifactId>
  <version>2.3.80</version>
  <executions>
    <execution>
      <configuration>
        <includeTest>true</includeTest>
      </configuration>
      <phase>process-test-classes</phase>
      <goals>
        <goal>validate</goal>
      </goals>
    </execution>
  </executions>
</plugin>