How could using Guava in an Android application cause problems at build time in particular?

Question:How could using Guava in an Android application cause problems at build time in particular?

1.The libraries are not supported by the Gradle build process.

2.The libraries are large and can cause the compiler to exceed the 65k method limit imposed by Java 7 and below.

3.The libraries must be compiled separately before the build process will complete.

4.They are deprecated, Google no longer support them so many of the methods that they contain will not compile.

Answer:2