Consider the pin-jointed truss shown in the figure. Influence line is drawn for the axial force in the member G-I, when a unit load travels on the bottom chord of the truss. Identify the CORRECT influence line from the following options:

Note: Positive value corresponds to tension and negative value corresponds to compression in the member.

In the pin-jointed truss shown in the figure, the members that carry zero force are identified. Which of the following options is/are zero-force members?

After applying the correction for elevation and temperature, the runway length is 700 m . The corrected runway length (in m ) for an effective gradient of $1 \%$ is __________ (round off to the nearest integer).