Final answer:
RIP-2, EIGRP, and OSPF all support Variable Length Subnet Masking (VLSM), whereas RIP-1 does not, as it is an older protocol without this capability.
Step-by-step explanation:
The routing protocols that support Variable Length Subnet Masking (VLSM) are RIP-2, EIGRP, and OSPF. RIP-1 does not support VLSM because it is an older protocol that does not support subnetting and the advertisement of subnet information.
On the other hand, RIP-2, EIGRP, and OSPF have been designed with the ability to handle VLSM, which is crucial for efficiently using IP address space and creating subnet designs that reduce waste.