What is expected of you as pilot on an IFR flight plan if you are descending or climbing in VFR conditions?

(Refer to figure 91.) What is the minimum crossing altitude at SABAT intersection when eastbound from DBS VORTAC on V298?

(Refer to figure 91.) What is the minimum crossing altitude at DBS VORTAC for a northbound IFR flight on V257?

(Refer to figure 93.) What are the normal lateral limits for Class D airspace?