Which command sequence on R1 sets external EIGRP administrative distance to 130 while keeping internal EIGRP at its default?

The distance eigrp internalad externalad command within EIGRP router configuration allows you to specify separate administrative distances for internal and external EIGRP routes. In this case, distance eigrp 90 130 sets the internal EIGRP AD to 90 (the default) and the external EIGRP AD to 130, fulfilling the requirement. The first incorrect option, distance 170, would set both internal and external EIGRP ADs to 170, which is not the desired outcome. The third incorrect option, distance eigrp 130 90, would incorrectly set the internal AD to 130 and the external AD to 90. The fourth incorrect option, distance 90 130, is missing the eigrp keyword and would be interpreted as a general administrative distance command, not specific to EIGRP.