Which of the following self-assigned indicators are acceptable when using a phone transmission?

When operating away from your primary station location, you may choose to append a self-assigned indicator to your call sign to show your current operating region, such as KL7CC operating in the W3 call area. This is written with a separator, like KL7CC/W3. When speaking this indicator on a phone (voice) transmission, the FCC allows flexibility in how you pronounce the separator character. "Stroke", "slant", and "slash" are all acceptable, standard phonetic terms used to verbalize the "/" symbol. There is no strict regulatory requirement favoring one over the other.