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An astable multivibrator circuit using IC $555$ timer is shown below. Assume that the circuit is oscillating steadily.

The voltage $V_{C}$ across the capacitor varies between

1. $3 \mathrm{V}$ to $5 \mathrm{V}$
2. $3 \mathrm{V}$ to $6 \mathrm{V}$
3. $3.6 \mathrm{V}$ to $6 \mathrm{V}$
4. $3.6 \mathrm{V}$ to $5 \mathrm{V}$