You would like to enable analytics tracking only in release builds. How can you create a new field in the generated BuildConfig class to store that value?
 A
buildTypes {
    debug {
        buildConfig 'boolean', 'ENABLE_ANALYTICS', 'false'
    }
    release {
        buildConfig 'boolean', 'ENABLE_ANALYTICS', 'true'
    }
}
 B
buildTypes {
    debug {
        buildConfig 'String', 'ENABLE_ANALYTICS', 'false'
    }
    release {
        buildConfig 'String', 'ENABLE_ANALYTICS', 'true'
    }
}
 C
buildTypes {
    debug {
        buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'false'
    }
    release {
        buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'true'
    }
}
 D
buildTypes {
    debug {
        buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'true'
    }
    release {
        buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'false'
    }
}