If an approach is being made to a runway that has an operating 3 bar VASI and all the VASI lights appear red as the airplane reaches the MDA, the pilot should

(Refer to figure 131.) What is the landing distance available for the VOR/DME RNAV RWY 4R approach at BOS?

(Refer to figure 136.) Which illustration depicts an “on glidepath” indication?

(Refer to figures 42 and 42A.) What is the difference in elevation (in feet MSL) between the airport elevation and the TDZE for RWY 36L?

(Refer to figure 138.) What night operations, if any, are authorized between the approach end of the runway and the threshold lights?