Which of the Following Options Can Improve Reliability of Syslog

Which of the following options can improve reliability of syslog delivery to Splunk? (Select all that apply.)

A) Use TCP syslog.
B) Configure UDP inputs on each Splunk indexer to receive data directly.
C) Use a network load balancer to direct syslog traffic to active backend syslog listeners.
D) Use one or more syslog servers to persist data with a Universal Forwarder to send the data to Splunk indexers.