Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to start building an android application [title] Install the java development kit. [step] Jdk or the java development kit is the first step to android app development. The recent jre (or the java runtime development) must be downloaded as the older versions might cause serious technical issues with the latest jdk that the developer would want to use for his app.

Ending1: [substeps] Click any java program database and locate " java development kit (jdk), " which is the final step to jdk's continuing development. Right-click on " download " and select " add programs " and " begin using jdk. Ending2: Step by step download and install jdk and java development kit from gapp.com/download. [title] Then start the development for the os. Ending3: Install the jdk and keep in mind that " development tools ", " source code " and " public jre " occur in the custom install window. Click " next ", read the licence agreement and there you go. Ending4: The developer can have the android app developed via trial. [title] Install an eclipse or phake application.

Answer format: ending1/ending2/ending3/ending4